Sahih Muslim 30b

Abu Bakr ibn Abi Shaybah narrated to us; Abu al-Ahwas, Sallam ibn Sulaym, narrated to us, from Abu Ishaq, from Amr ibn Maymun, from Mu'adh ibn Jabal, who said: I was riding behind the Messenger of Allah (peace and blessings be upon him) on a donkey called Ufayr. He said, ‘Mu'adh, do you know what right Allah has over the servants and what right the servants have over Allah?’ I said, ‘Allah and His Messenger know best.’ He said, ‘Allah's right over the servants is that they worship Allah and associate nothing with Him; and the servants' right over Allah, Mighty and Majestic, is that He not punish whoever associates nothing with Him.’ I said, ‘Messenger of Allah, shall I not give the people this good news?’ He said, ‘Do not give them this good news, lest they rely upon it.’