Surah Adz-Dzariyah (The Scattering Winds), Verse 18

وَبِالْاَسْحَارِ هُمْ یَسْتَغْفِرُوْنَ ۟

Wa bil as haari hum yastaghfiroon

“And in the hours of early dawn, they (were found) praying for Forgiveness;”

Quran 51:18 (Yusuf Ali Translation)