Al-Hadid 57:6

Yooliju allayla fee annahariwayooliju annahara fee allayi wahuwa AAaleemun bithatiassudoor

He causes the night to enter the day and causes the day to enter the night, and He is Knowing of that within the breasts.

He makes the night enter into the day, and makes the day enter into the night, and He is All-Knowing about whatever lies in the hearts.