(46) باب اسْمِ الْفَرَسِ وَالْحِمَارِ
Narrated Mu`adh:
I was a companion rider of the Prophet (ﷺ) on a donkey called 'Ufair. The Prophet (ﷺ) asked, "O Mu`adh! Do you know what Allah's right on His slaves is, and what the right of His slaves on Him is?" I replied, "Allah and His Apostle know better." He said, "Allah's right on His slaves is that they should worship Him (Alone) and should not worship any besides Him. And slave's right on Allah is that He should not punish him who worships none besides Him." I said, "O Allah's Messenger (ﷺ)! Should I not inform the people of this good news?" He said, "Do not inform them of it, lest they should depend on it (absolutely).
Reference: Sahih al-Bukhari 2856
In-book reference: Book 56, Hadith 72
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 4, Book 52, Hadith 108