Sayyiduna Anas bin Malik (may Allah be pleased with him) said: We came to Sayyiduna Mu'adh (may Allah be pleased with him) and said: Narrate to us the hadith that you heard from the Messenger of Allah (peace and blessings be upon him). He said: The Messenger of Allah (peace and blessings be upon him) seated me behind him on his mount and said: "Do you know what the right of Allah over His servants is?" I said: Allah and His Messenger know best. He said: "His right over them is that they worship Him and do not associate anything with Him." Then he said: "Do you know what their right over Allah is when they do that? Their right over Allah is that He does not punish them."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17220