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

أَسْتَغْفِرُ اللَّهَ الْعَظِيمَ الَّذِي لَا إِلَهَ إِلَّا هُوَ الْحَيُّ الْقَيُّومُ وَأَتُوبُ إِلَيهِ

Astaghfirullaahal-'Adheemal-ladhee laa 'ilaaha 'illaa Huwal-Hayyul-Qayyoomu wa 'atoobu 'ilayhi

I seek Allah's forgiveness, besides whom, none has the right to be worshipped except He, The Ever Living, The Self-Subsisting and Supporter of all, and I turn to Him in repentance. 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. Abu Dawud 1517 [2] Sahih. Tirmidhi 3579 [3] Muslim 482 [4] Muslim 2702