Sahih al-Bukhari Book 77, Hadith 184
We were coming from Khaibar along with Allah's Messenger (ﷺ) while l was riding behind Abu Talha
and he was proceeding. While one of the wives of Allah's Messenger (ﷺ) was riding behind Allah's Messenger (ﷺ),
suddenly the foot of the camel Slipped and I said, "The woman!" and alighted (hurriedly). Allah's
Apostle said, "She is your mother." Sol resaddled the she-camel and Allah's Messenger (ﷺ) mounted it.
When he approached or saw Medina, he said, "Ayibun, ta'ibun, 'abidun, li-Rabbina hami-dun."
While I was riding behind the Prophet (ﷺ) and between me and him and between me and him there was only the back of the saddle, he said, "0 Mu`adh!" I replied, "Labbaik, 0 Allah's Messenger (ﷺ), and Sa`daik!" he said, "Do you know what is Allah's right upon his slave?" I said, "Allah and His Apostle know best" He said "Allah's right upon his slaves is that they should worship Him alone and not worship anything else besides Him." Then he proceeded for a while and then said, "O Mu`adh bin Jabal!" I replied, "Labbaik, O Allah's Messenger (ﷺ):, Sa`daik!' He said, "Do you know what is the right of the slaves upon Allah if they do that?" I replied, "Allah and His Apostle know best." He said, "The right of the slaves upon Allah is that He will not punish them (if they do that).
I saw the Prophet (ﷺ) lying-down in the mosque and placing one leg on the other.