The Prophet (ﷺ) added: The person who says:

أَسْتَغْفِرُ اللَّهَ الْعَظِيمَ الَّذِيْ لَا إِلَهَ إِلَّا هُوَ الْحَيُّ الْقَيُّومُ وَأَتُوبُ إِلَيْهِ

Astaghfirulla-hal adhemal-ladhee laa ilaaha illaa huwal hayyul qayyoomu wa atoobu ilayhi

I seek the forgiveness of Allah the Mighty, Whom there is none worthy of worship except Him, the Living, the Eternal, and I repent to Him. Allah would forgive him even if he was one who fled during the advance of an army." [1] He (ﷺ) said: "The nearest the Lord comes to His servant is in the middle of the night, so if you are able to be of those who remember Allah at that time, then be so." [2] He (ﷺ) also said: "The nearest a servant is to his Lord is when he is prostrating, so supplicate much therein." [3] He (ﷺ) also said: "Verily my heart becomes preoccupied, and verily I seek Allah"s forgiveness a hundred times a day." [4]

Reference: [1] Sahih (Albani). Abu Dawud: 1517 [2] Sahih (Albani). Tirmidhi: 3579 [3] Muslim: 482 [4] Muslim: 2702