Not graded
Hisn al-Muslim (Fortress of the Muslim) 263
كَانَ الرَّجُلُ إِذَا أَسْلَمَ عَلَّمَهُ النَّبيُّ صلى الله عليه وسلم الصَّلاَةَ ثُمَّ أَمَرَهُ أَنْ يَدْعُوَ بِهَؤُلاَءِ الْكَلِمَاتِ: ((اللَّهُمَّ اغْفِرِ لِي، وَارْحَمْنِي، وَاهْدِنِي، وَعَافِنِي وَارْزُقْنِي)).
(Tariq Al-AshjaAAee said: ‘When someone would embrace Islam, the Prophet would teach him how to perform prayer and then order him to supplicate with the following words: (O Allah, forgive me, have mercy upon me, guide me, give me health and grant me sustenance.))
Cited in Hisn al-Muslim (Fortress of the Muslim) (No. 263).