Mu’adh Bin Jabal (may Allah be pleased with him), narrated: I was riding behind the Prophet (peace be upon him) and there was nothing between him and me but the part of the saddle when he said: Mu’adh Bin Jabal, to which I replied: At your beck and call, and at your pleasure, Messenger of Allah (peace be upon him). He moved along for a while when again he said: Mu’adh bin Jabal, to which I replied: At your beck and call, and at your pleasure, Messenger of Allah(peace be upon him). He then again moved along for a while and said: Mu’adh bin Jabal, to which I replied: At your beck and call, and at your pleasure, Messenger of Allah (peace be upon him). He (the Holy Prophet) asked: Do you know what right has Allah upon His servants? I said: Allah and His Messenger know best. He (the Prophet, peace be upon him) said: Verily the right of Allah over His servants is that they should worship Him, not associating anything with Him. He (peace be upon him), with Mu’adh behind him, moved along for a while and said: Mu’adh Bin Jabal, to which I replied: At your beck and call, and at your pleasure, Messenger of Allah (peace be upon him). He asked: Do you know the servants’ rights upon Allah in case they do it (i.e. they worship Allah without associating anything with Him)? I (Mu’adh bin Jabal) replied: Allah and His Messenger know best. (Upon this) he (the Prophet, peace be upon him) remarked: That He would not torment them (with the fire of Hell).

Hadith number in Sahih Muslim [Arabic only]: 43