The following rendition of Muhammad's 'Farewell Sermon', along with a second version, was for many years quoted on Wikipedia without a primary source.
Despite being fraudulent, it has become popular among Muslims, due to including the lines, "an Arab has no superiority over a non-Arab nor a non-Arab has any superiority over an Arab; also a white has no superiority over black nor a black has any superiority over white".
O People, lend me an attentive ear, for I know not whether after this year, I shall ever be amongst you again. Therefore listen to what I am saying to you very carefully and take these words to those who could not be present here today.
O People, just as you regard this month, this day, this city as Sacred, so regard the life and property of every *Muslim as a sacred trust. Return the goods entrusted to you to their rightful owners. Hurt no one so that no one may hurt you. Remember that you will indeed meet your Lord, and that He will indeed reckon your deeds. God has forbidden you to take usury (interest), therefore all interest obligation shall henceforth be waived. Your capital, however, is yours to keep. You will neither inflict nor suffer any inequity. God has judged that there shall be no interest and that all the interest due to Abbas ibn 'Abd'al Muttalib (Prophet's uncle) shall henceforth be waived...
Beware of Satan, for the safety of your religion. He has lost all hope that he will ever be able to lead you astray in big things, so beware of following him in small things.
O People, it is true that you have certain rights with regard to your women, but they also have rights over you. Remember that you have taken them as your wives only under God's trust and with His permission. If they abide by your right then to them belongs the right to be fed and clothed in kindness. Do treat your women well and be kind to them for they are your partners and committed helpers. And it is your right that they do not make friends with any one of whom you do not approve, as well as never to be unchaste.
O People, listen to me in earnest, worship God, say your five daily prayers (Salah), fast during the month of Ramadan, and give your wealth in Zakat. Perform Hajj if you can afford to.
All mankind is from Adam and Eve, an Arab has no superiority over a non-Arab nor a non-Arab has any superiority over an Arab; also a white has no superiority over black nor a black has any superiority over white except by piety and good action. Learn that every Muslim is a brother to every Muslim and that the Muslims constitute one brotherhood. Nothing shall be legitimate to a Muslim which belongs to a fellow Muslim unless it was given freely and willingly. Do not, therefore, do injustice to yourselves.
Remember, one day you will appear before God and answer your deeds. So beware, do not stray from the path of righteousness after I am gone.
O People, no prophet or apostle will come after me and no new faith will be born. Reason well, therefore, O People, and understand words which I convey to you. I leave behind me two things, the Quran and my Ahl al-Bayt and if you follow these you will never go astray.
All those who listen to me shall pass on my words to others and those to others again; and may the last ones understand my words better than those who listen to me directly. Be my witness, O God, that I have conveyed your message to your people
S.F.H. Faizi, an Indian, later Pakistani, Islamist is the author of "Sermons of the Prophet", the 1987 book which first rendered this version of the sermon (in the 1991 edition, it can be found on p. 145).
He gets us as close to a source as he could when he describes in the introduction how he translated and published a collection of obscure writings into English:
This book is a collection of some of the selected sermons of the Holy Prophet which include long as well short ones as the situation demanded. They were not available in the form of Khutbas but have been derived from various books of Ahadith and history. It is only recently that some of these have appeared in book-forms along with original texts and translation in Urdu; but the authenticity of the texts thereof is still doubted by ulema. On English language, they are hardly available. So an attempt has been made not only to have them translated in English but also to find out circumstances under which they were delivered so that their delivery date could be ascertained and an elucidation made thereof. How far I have succeeded in my undertaking rests to be adjudged by the readers. Any suggestion or comment shall, however be welcomed to improve upon it.
In summation, Faizi “derived” this version of the sermon from various unnamed books not accepted by the ulema (scholarly Muslim clerics). He does not know the original sources, but welcomes readers to help in his search.
References which are often cited as sources for this fraudulent sermon, once checked, are either misrepresented (i.e. they have nothing to say on the sermon) or in fact refer to the sermon that most fits al-Tabari's rendition ( For example; this site lists al-Tirmidhi as one of the sources. However in Tirmidhi we find the farewell command to beat women, and that they are "like prisoners" in the hands of men).
The following authentic version is taken from al-Tabari, Vol IX, and it's important to note that it is in perfect agreement with the Qur'anic order of wife-beating in Qur'an 4:34. Attempts to add this authentic version next to the other two at Wikipedia, had been met with resistance.
O people, listen to my words. I do not know whether I shall ever meet you again in this place after this year. O people, your blood and your property are sacrosanct until you meet your Lord, just as this day and this month of yours are sacred. Surely you will meet your Lord and He will question you about your deeds. I have [already] made this known. Let he who has a pledge return it to the one who entrusted him with it; all usury is abolished, but your capital belongs to you. Wrong not and you shall not be wronged. Allah has decreed that there will be no usury, and the usury of Abbas b. Abd al-Muttalib is abolished, all of it. All blood shed in the pre-Islamic days is to be left unavenged. The first such claim I revoke is that of Ibn Rabiah b. al-Harith b. Abd al-Muttalib, who was nursed among the Banu Layth and was slain by the Banu Hudhayl. His is the first blood shed in the pre-Islamic days with which I shall set an example. O people, indeed Satan despairs of ever being worshipped in this land of yours. He will be pleased, however, if he is obeyed in a thing other than that, in matters you minimize. So beware of him in your religion, O people, intercalculating a month is an increase in unbelief whereby the unbelievers go astray; one year they make it profane, and hallow it another [in order] to agree with the number that Allah has hallowed, and so profane what Allah has hallowed, and hallow what Allah has made profane. Time has completed its cycle [and is] as it was on the day that Allah created the heavens and the earth. The number of the months with Allah is twelve; [they were] in the Book of Allah on the day He created the heavens and the earth. Four of them are sacred, the three consecutive [months] and the Rajab [which is the month of] Mudar, which is between Jumada and Sha’ban.
Now then, O people, you have a right over your wives and they have a right over you. You have [the right] that they should not cause anyone of whom you dislike to tread on your beds; and that they should not commit any open indecency. If they do, then Allah permits you to shut them in separate rooms and to beat them, but not severely. If they abstain from [evil], they have the right to their food and clothing in accordance with the custom. Treat women well, for they are [like] domestic animals with you and do not possess anything for themselves. You have taken them only as a trust from Allah, and you have made the enjoyment of their persons lawful by the word of Allah, so understand and listen to my words, O people. I have conveyed the Message, and have left you with something which, if you hold fast to it, you will never go astray; that is, the Book of Allah and the sunnah of his Prophet. Listen to my words, O people, for I have conveyed the Message and understand [it]. Know for certain that every Muslim is a brother of another Muslim, and that all Muslims are brethren. It is not lawful for a person [to take] from his brother except that which he has given him willingly, so do not wrong yourselves. O Allah, have I not conveyed the message? [Al-Tabari, Vol. 9, pp. 112-113]
After an April 2011 Wikipedia discussion concerning the lack of primary sources for the fraudulent sermons, they were finally removed from the site. But, as is often the case with Islam-related articles, the unreferenced material is constantly reinserted by Muslim editors.