Musnad Abu Ya'la al-Mawsili 6:108

Zuhayr narrated to us, Ja'far ibn 'Awn narrated to us, Musa al-Juhani informed us, from Mus'ab ibn Sa'd, from his father, who said: A man came to the Prophet, may Allah bless him and grant him peace, and said: "Teach me words that I may say." He said: "Say: 'There is no god but Allah alone, He has no partner. Allah is the Greatest, [in] greatness, and praise be to Allah, [in] abundance. Glory be to Allah, Lord of the worlds. There is no power and no strength except by Allah, the Almighty, the Wise.'" He said: "This is for my Lord, so what is for me?" He said: "Say: 'O Allah, forgive me, have mercy on me, guide me, grant me well-being, and provide for me.'"