اَللَّهُمَّ اغْفِرْ لِي وَارْحَمْنِيْ وَاهْدِنِيْ وَعَافِنِيْ وَارْزُقْنِيْ

Allaahummaghfir lee, war'hamnee, wa'hdinee, wa 'aafinee warzuqnee

O Allah forgive me, and have mercy on me and guide me and give me good health and provide rizq for me. Abu Malik reported on the authority of his father that when a person embraced Islam, Allah's Messenger (ﷺ) used to teach him how to observe prayer and then commanded him to supplicate in these words.

Reference: Muslim: 2697