once
وَقَالَ صلى الله عليه وسلم: ((مَنْ قَالَ أَسْتَغْفِرُ اللَّهَ الْعَظيمَ الَّذِي لاَ إِلَهَ إِلاَّ هُوَ الْحَيُّ القَيّوُمُ وَأَتُوبُ إِلَيهِ، غَفَرَ اللَّهُ لَهُ وَإِنْ كَانَ فَرَّ مِنَ الزَّحْفِ)).
Edition transliteration
He also said: ‘Whoever says:(Astaghfirul-lahal-lathee la ilaha illa huwal-hayyul-qayyoomu wa-atoobu ilayh.) Allah would forgive him even if he was one who fled during the advance of an army.
Meaning
He also said: ‘Whoever says:(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.
Source and references
Hisn al-Muslim, entry 250.The reference is copied from the edition; separate editorial verification is not complete yet.
Source edition: Fortress of the Muslim. Open source ↗