حَدَّثَنَا أَبُو كَامِلٍ الْجَحْدَرِيُّ، حَدَّثَنَا عَبْدُ الْوَاحِدِ، - يَعْنِي ابْنَ زِيَادٍ - حَدَّثَنَا أَبُو مَالِكٍ الأَشْجَعِيُّ عَنْ أَبِيهِ، قَالَ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يُعَلِّمُ مَنْ أَسْلَمَ يَقُولُ ‏"‏ اللَّهُمَّ اغْفِرْ لِي وَارْحَمْنِي وَاهْدِنِي وَارْزُقْنِي ‏"‏ ‏.‏

Abu Malik Ashaja'i reported on the authority of his father that whenever a person embraced Islam, Allah's Messenger (PBUH) instructed him to recilte: " O Allah, grant me pardon, have mercy upon me, direct me to the path of righteousness and provide me sustenance." Translation Not Available

Book Ref: Sahih Muslim Book 48 Hadith 6514
Web Ref:  Sahih Muslim Book 35 Hadith 2697 a