The Book of Prayer

Bulugh al-Maram #391

كتاب الصلاة

وَعَنْ ثَوْبَانَ ‏- رضى الله عنه ‏- قَالَ: ‏"‏كَانَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-إِذَا اِنْصَرَفَ مِنْ صَلَاتِهِ اِسْتَغْفَرَ اَللَّهَ ثَلَاثًا, وَقَالَ: " اَللَّهُمَّ أَنْتَ اَلسَّلَامُ وَمِنْكَ اَلسَّلَامُ.‏ تَبَارَكْتَ يَا ذَا اَلْجَلَالِ وَالْإِكْرَامِ‏"‏ رَوَاهُ مُسْلِمٌ.

Narrated Thauban (RA):

Whenever Allah's Messenger (ﷺ) finished his prayer, he used to say after asking Allah's forgiveness three times: “O Allah, You are as-Salam (One Free from every defect), and as-Salam (safety from every evil) is (sought) from You. Blessed are You, O Possessor of glory and honour.”

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