Quran 51:18 from Surah Adh-Dhaariyat on Divine Marvels.
وَبِٱلۡأَسۡحَارِ هُمۡ يَسۡتَغۡفِرُونَ
English translation: And in the hours before dawn they would ask forgiveness
Transliteration: wabil-ashari hum yastaghfiruna