Musannaf Ibn Abi Shayba 33:1434

Ubayd Allah ibn Musa narrated to us, he said: Hammam informed us, from Qatadah, from Muslim ibn Yasar, who said: There are two wide valleys whose depths cannot be reached, and people have traveled through them. So perform a deed while knowing that nothing will save you except a righteous deed. And rely with the reliance of a man who knows that nothing will afflict him except what Allah has written for him.