Thauban (May Allah be pleased with him) reported: Whenever the Messenger of Allah ﷺ finished his Salat (prayer), he would beg forgiveness three times by saying, 'Astaghfirullah' (3 times) and then he would say: "Allahumma Antas-Salamu, wa minkas-Salamu, tabarakta ya Dhal-Jalali wal-Ikram. (O Allah! You are the Bestower of security and security comes from You; Blessed are You. O Possessor of glory and honour)". Imam Al-Auza'i (one of the sub-narrators) of this Hadith was asked: "How forgiveness should be sought?" He replied: "I say: Astaghfirullah, Astaghfirullah (I seek forgiveness from Allah. I seek forgiveness from Allah)". Muslim.