The Prophet (ﷺ) used to stand in the night prayer and say this first 10 times:
اَللَّهُ اَكْبَرُ
Pronunciation
Allahu Akbaar
Meaning
Allah is the greatest!
Source: Hasan Sahih (Al-Albani). Abu Dawud: 766
Duas from IslamicAPI's Masnun Dua dataset (based on the Quran, hadith, Hisnul Muslim and Rahe Belayat). See the dataset