Sahih Bukhari

Narrated Mu`adh bin Jabal:While I was riding behind the Prophet (ﷺ) as a companion rider and there was nothing between me and him except the back of the saddle, he said, ""O Mu`adh!"" I replied, ""Labbaik O Allah's Messenger (ﷺ)! And Sa`daik!"" He proceeded for a while and then said, ""O Mu`adh!"" I said, ""Labbaik and Sa`daik, O Allah's Messenger (ﷺ)!"" He then proceeded for another while and said, ""O Mu`adh bin Jabal!"" I replied, ""Labbaik, O Allah's Messenger (ﷺ), and Sa`daik!"" He said, ""Do you know what is Allah's right on His slaves?"" I replied, ""Allah and His Apostle know better."" He said, ""Allah's right on his slaves is that they should worship Him and not worship anything besides Him."" He then proceeded for a while, and again said, ""O Mu`adh bin Jabal!"" I replied. ""Labbaik, O Allah's Messenger (ﷺ), and Sa`daik."" He said, ""Do you know what is (Allah's) slaves' (people's) right on Allah if they did that?"" I replied, ""Allah and His Apostle know better."" He said, ""The right of (Allah's) slaves on Allah is that He should not punish them (if they did that)