Musnad Abu Ya'la al-Mawsili 51:13

Abu Khaythama narrated to us, Yahya bin Sa'id narrated to us, from Mis'ar, al-Walid bin Sari' narrated to me, from 'Amr bin Hurayth, who said: I heard the Messenger of Allah (may Allah bless him and grant him peace) reciting in the morning prayer: "By the night when it departs" (Surah at-Takwir). Or he said: "When the sun is wrapped up" (Surah at-Takwir).