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Hisn al-Muslim (Fortress of the Muslim) 66
((أَسْتَغْفِرُ اللَّهَ (ثَلاَثَاً) اللَّهُمَّ أَنْتَ السَّلاَمُ، وَمِنْكَ السَّلاَمُ، تَبَارَكْتَ يَا ذَا الْجَلاَلِ وَالْإِكْرَامِ)).
(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.))
Cited in Hisn al-Muslim (Fortress of the Muslim) (No. 66).