Sayyiduna Mu'adh bin Jabal (may Allah be pleased with him) said: I was riding behind the Messenger of Allah (peace and blessings be upon him), and the Messenger of Allah (peace and blessings be upon him) said: "O Mu'adh bin Jabal! Do you know what the right of Allah over His servants is?" I said: Allah and His Messenger know best. He said: "That they do not associate anything with Him." Then he said: "Then do you know what their right over Him is when they do that?" I said: Allah and His Messenger know best. He said: "That He does not punish them."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17219