Istighfar three times, then "Allahumma anta's-salam"
Every prayer, right after the salamأَسْتَغْفِرُ اللّٰهَ اَللّٰهُمَّ أَنْتَ السَّلَامُ وَمِنْكَ السَّلَامُ
- Muslim 591 Sahih ThawbanWhen the Prophet finished his prayer he asked forgiveness three times, then said these exact words.
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عَنْ ثَوْبَانَ، قَالَ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم إِذَا انْصَرَفَ مِنْ صَلاَتِهِ اسْتَغْفَرَ ثَلاَثًا وَقَالَ " اللَّهُمَّ أَنْتَ السَّلاَمُ وَمِنْكَ السَّلاَمُ تَبَارَكْتَ ذَا الْجَلاَلِ وَالإِكْرَامِ "
Thawban reported: When the Messenger of Allah ﷺ finished his prayer, he would ask Allah's forgiveness three times and then say: "O Allah, You are Peace, and from You comes peace. Blessed are You, Possessor of Majesty and Honor."
قَالَ الْوَلِيدُ فَقُلْتُ لِلأَوْزَاعِيِّ كَيْفَ الاِسْتِغْفَارُ قَالَ تَقُولُ أَسْتَغْفِرُ اللَّهَ أَسْتَغْفِرُ اللَّهَ
Al-Walid (a narrator in the chain) said: I asked al-Awza'i, "How is the asking of forgiveness done?" He said: "You say: Astaghfirullah, astaghfirullah (I ask Allah's forgiveness, I ask Allah's forgiveness)."
- Muslim 592 Sahih 'A'ishaAfter the salam he sat only as long as it takes to say this phrase.
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عَنْ عَائِشَةَ، قَالَتْ كَانَ النَّبِيُّ صلى الله عليه وسلم إِذَا سَلَّمَ لَمْ يَقْعُدْ إِلاَّ مِقْدَارَ مَا يَقُولُ " اللَّهُمَّ أَنْتَ السَّلاَمُ وَمِنْكَ السَّلاَمُ تَبَارَكْتَ ذَا الْجَلاَلِ وَالإِكْرَامِ "
'A'isha reported: When the Prophet ﷺ ended the prayer with the salam, he would stay seated only for as long as it takes to say: "O Allah, You are Peace, and from You comes peace. Blessed are You, Possessor of Majesty and Honor."
وَفِي رِوَايَةِ ابْنِ نُمَيْرٍ " يَا ذَا الْجَلاَلِ وَالإِكْرَامِ " .
In the narration of Ibn Numayr: "...O Possessor of Majesty and Honor."