It is narrated from Sayyiduna Abu Malik al-Ash'ari (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "When one of you reaches the morning, let him say: We have reached the morning, and the dominion has reached the morning belonging to Allah, the Lord of the worlds. O Allah, I ask You for the good of this day: its victory, its help, its light, its blessing and its guidance; and I seek refuge in You from the evil that is in it, and from the evil of what is before it and the evil of what is after it. Then when he reaches the evening, let him say the same."
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 3440