Sahih Bukhari | Volume 8 | Hadith Number 283

Narrated by Muadh
While I was a companion rider with the Prophet he said, "O Mu'adh!" I replied, "Labbaik wa Sa'daik." He repeated this call three times and then said, "Do you know what Allah's Right on His slaves is?" I replied, "No." He said, Allah's Right on His slaves is that they should worship Him (Alone) and should not join partners in worship with Him." He said, "O Mu'adh!" I replied, "Labbaik wa Sa'daik." He said, "Do you know what the right of (Allah's) salves on Allah is, if they do that (worship Him Alone and join none in His

worship)? It is that He will not punish them."