Not graded
Hisn al-Muslim (Fortress of the Muslim) 140
((مَا مِنْ عَبْدٍ يُذنِبُ ذَنْباً فَيُحْسِنُ الطُّهُورَ، ثُمَّ يَقُومُ فَيُصَلِّي رَكْعَتَيْنِ، ثُمَّ يَسْتَغْفِرُ اللَّهَ إِلاَّ غَفَرَ اللَّهُ لَهُ)).
(Any servant who commits a sin and as a result, performs ablution, prays two units of prayer (i.e. two rakAAas) and then seeks Allah’s forgiveness, Allah would forgive him.)
Cited in Hisn al-Muslim (Fortress of the Muslim) (No. 140).