once
أَسْتَغْفِرُ اللَّهَ (ثَلاَثَاً) اللَّهُمَّ أَنْتَ السَّلاَمُ، وَمِنْكَ السَّلاَمُ، تَبَارَكْتَ يَا ذَا الْجَلاَلِ وَالْإِكْرَامِ
Edition transliteration
Astaghfirul-lah (three times) (Allahumma antas-salam waminkas-salam, tabarakta ya thal-jalali wal-ikram.)
Meaning
I ask Allah for forgiveness.(three times) (O Allah, You are As-Salam and from You is all peace, blessed are You, O Possessor of majesty and honour.) (AS-Salam: The One Who is free from all defects and deficiencies.)
Source and references
Hisn al-Muslim, entry 66.The reference is copied from the edition; separate editorial verification is not complete yet.
Source edition: Fortress of the Muslim. Open source ↗