أَسْتَغْفِرُ اللَّهَ، أَسْتَغْفِرُ اللَّهَ، أَسْتَغْفِرُ اللَّهَ. اللَّهُمَّ أَنْتَ السَّلَامُ وَمِنْكَ السَّلَامُ، تَبَارَكْتَ يَا ذَا الْجَلَالِ وَالْإِكْرَامِ
The Messenger of Allah (peace be upon him), when he finished his prayer, would seek forgiveness three times and say: 'Allahumma Antas-Salam wa minkas-Salam, tabarakta ya Dhal-Jalali wal-Ikram.'