Musnad Ahmad 8:122

Yahya ibn Sa'id narrated to us, from Musa al-Juhani, Mus'ab ibn Sa'd narrated to me, from his father, that a Bedouin came to the Prophet, peace and blessings of Allah be upon him, 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, [much] greatness; and praise be to Allah, much praise; and glory be to Allah, Lord of the worlds; and there is no power and no strength except by Allah, the Almighty, the Wise,' five times." He said: "These are for my Lord, so what is for me?" He said: "Say: 'O Allah, forgive me, and have mercy on me, and provide for me, and guide me, and grant me well-being.'"