Sahih Muslim 126
The Book of Faith
Clarification that Allah, most high allows a person's thoughts and whatever occurs in his heart, so long as they do not become established, and the clarification that he, glorious is he and most high, does not burden anyone with more than he can bear, and clarifying the ruling on thinking of doing good and bad deeds
It is narrated on the authority of Ibn 'Abbas: When this verse:" Whether you disclose that which is in your mind or conceal it, Allah will call you to account according to it" (ii 284), there entered in their minds something (of that fear) such as had never entered their hearts (before). The Messenger (ﷺ) observed: Say: We have heard and obeyed and submitted ourselves. He (the reporter) said: Allah instilled faith in their hearts and He revealed this verse:" Allah burdens not a soul beyond its capacity. It gets every good that it earns and it suffers every ill that it earns. Our Lord, call us not to account if we forget or make a mistake. He the (Lord) said: I indeed did it. Our Lord! do not lay on us a burden as You didst lay on those before us. He (our Lord) said: I indeed did it. And pardon us, have mercy on us. You are our Protector" (ii. 286). He said: I indeed did it.