Musannaf Ibn Abi Shayba 17:1240

Abu al-Ahwas narrated to us, from Mansur, from Rib'i ibn Hirash, from a man from al-Nakha', from Salman, who said: Whoever says when he enters the morning: "O Allah, You are my Lord, there is no partner for You. We have entered the morning, and the dominion has entered the morning belonging to Allah, and praise is to Allah, there is no partner for Him," and when he enters the evening says the like of that, it will be an expiation for what occurred between them.