Said two men from those who feared [to disobey] upon whom Allah had bestowed favor, "Enter upon them through the gate, for when you have entered it, you will be predominant. And upon Allah rely, if you should be believers."
And recite to them the story of Adam's two sons, in truth, when they both offered a sacrifice [to Allah ], and it was accepted from one of them but was not accepted from the other. Said [the latter], "I will surely kill you." Said [the former], "Indeed, Allah only accepts from the righteous [who fear Him].
Then Allah sent a crow searching in the ground to show him how to hide the disgrace of his brother. He said, "O woe to me! Have I failed to be like this crow and hide the body of my brother?" And he became of the regretful.