After salat

Thawban, the freed slave of Allah's Messenger (ﷺ), narrated that: Allah's Messenger (ﷺ) said: "When Allah's Messenger (ﷺ) wanted to turn from his Salat, he would seek forgiveness from Allah three times, then say: (Allahumma Antas-Salam, wa minkas-salam, tabarakta ya dhal-jalali wal-Ikram) 'O Allah! You are the One free of defects and perfection is from You. Blessed are You, O Possesor of Majesty and Honor.'" " اللَّهُمَّ أَنْتَ السَّلاَمُ وَمِنْكَ السَّلاَمُ تَبَارَكْتَ يَا ذَا الْجَلاَلِ وَالإِكْرَامِ " Jami` at-Tirmidhi 300