Sahih al-Bukhari — Oneness, Uniqueness of Allah (Tawheed) — Hadith No: 7499
Translation
Narrated Ibn `Abbas:Whenever the Prophet (ﷺ) offered the night (Tahajjud) prayer, he used to say, "O Allah! All the Praises are for You; You are the Light of the Heavens and the Earth. And all the Praises are for You; You are the Keeper of the Heavens and the Earth. All the Praises are for You; You are the Lord of the Heavens and the Earth and whatever is therein. You are the Truth, and Your Promise is the Truth, and Your Speech is the Truth, and meeting You is the Truth, and Paradise is the Truth and Hell (Fire) is the Truth and all the prophets are the Truth and the Hour is the Truth. O Allah! I surrender to You, and believe in You, and depend upon You, and repent to You, and in Your cause I fight and with Your orders I rule. So please forgive my past and future sins and those sins which I did in secret or in public. It is You Whom I worship, None has the right to be worshipped except You ." (See Hadith No. 329,Vol)