أَسْتَغْفِرُ اللَّهَ أَسْتَغْفِرُ اللَّهَ أَسْتَغْفِرُ اللَّهَ
Astaghfirullah, Astaghfirullah, Astaghfirullah
I seek Allah's forgiveness (three times).
The very first thing the Prophet ﷺ would say after giving the salam in prayer — before any other dhikr. Three times. You just finished standing before Allah, bowing, prostrating — yet the first thing you say is "forgive me." Why? Because no prayer is perfect. Your mind wandered, your khushu' wavered, your standing was imperfect. Istighfar after prayer is humility about the quality of your worship.
Related Du'as
رَبَّنَا لَا تُزِغْ قُلُوبَنَا بَعْدَ إِذْ هَدَيْتَنَا وَهَبْ لَنَا مِن لَّدُنكَ رَحْمَةً ۚ إِنَّكَ أَنتَ الْوَهَّابُ
Our Lord, do not let our hearts deviate after You have guided us, and grant us mercy from Yourself. Indeed, You are the Bestower.
Sahihأَسْتَغْفِرُ اللَّهَ أَسْتَغْفِرُ اللَّهَ أَسْتَغْفِرُ اللَّهَ اللَّهُمَّ أَنْتَ السَّلَامُ وَمِنْكَ السَّلَامُ تَبَارَكْتَ يَا ذَا الْجَلَالِ وَالْإِكْرَامِ
I seek Allah's forgiveness (three times). O Allah, You are Peace and from You is peace. Blessed are You, O Owner of Majesty and Honor.
Sahihاللَّهُمَّ لَا تَدَعْ لَنَا ذَنْبًا إِلَّا غَفَرْتَهُ وَلَا هَمًّا إِلَّا فَرَّجْتَهُ وَلَا دَيْنًا إِلَّا قَضَيْتَهُ وَلَا حَاجَةً مِنْ حَوَائِجِ الدُّنْيَا وَالْآخِرَةِ إِلَّا قَضَيْتَهَا بِرَحْمَتِكَ يَا أَرْحَمَ الرَّاحِمِينَ
O Allah, leave no sin of ours except that You forgive it, no worry except that You relieve it, no debt except that You settle it, and no need of this world or the next except that You fulfill it, by Your mercy, O Most Merciful of the merciful.
Hasanاللَّهُمَّ إِنِّي أَعُوذُ بِكَ مِنَ الْكُفْرِ وَالْفَقْرِ وَعَذَابِ الْقَبْرِ
O Allah, I seek refuge in You from disbelief, poverty, and the punishment of the grave.
Sahih