Tawheed

The Prophet صلى الله عليه وسلم said, “O Mu’adh! Do you know what Allah’s Right upon His slaves is?” I said, “Allah and His Apostle know best.” The Prophet صلى الله عليه وسلم said, “To worship Him (Allah) Alone and to join none in worship with Him (Allah). Do you know what their right upon Him is?” I replied, “Allah and His Apostle know best.” The Prophet صلى الله عليه وسلم said, “Not to punish them (if they do so).” (Sahih Bukhari)