Is prophet Muhammad's "Last Sermon" an accurate translation?

[The poorly-cited Wikipedia article](http://en.wikipedia.org/wiki/The_Farewell_Sermon) states: > The Farewell Sermon (Arabic: خطبة الوداع‎, Khuṭbatu l-Wadā), also > known as Muhammad's Final Sermon or The Last Sermon, was delivered by > Muhammad on the 9th of Dhu al-Hijjah, 10 AH (9 March 632) in the > Uranah valley of Mount Arafat. [This page](http://www.islam-watch.org/authors/89-other-authors/134-fraudulent-translation-of-muhammad-last-sermon-egalitarian.html) states that his famed "Last Sermon" is a fake from 1991. The top of 4.630.000 Google results for "[last sermon](https://www.google.nl/search?q=last+sermon) " are indeed unsourced. As [my last Facebook comment quoting it](https://www.facebook.com/photo.php?fbid=3857469006279&set=a.1273801416204.2032216.1564999382&type=1) got [censored without comment](https://www.facebook.com/photo.php?fbid=3857468566268&set=a.1273801416204.2032216.1564999382&type=1) , I'd like to know whether that part ("You will neither inflict nor suffer any inequity.") was representative of the religion of Islam.