Abdullah bin Abi Awfa (may Allah be pleased with him) narrates that a man came to the Messenger of Allah (peace and blessings be upon him) and said: I cannot recite the Qur'an well; teach me something that will suffice me in place of the Qur'an. He (peace and blessings be upon him) said: "Say: 'Al-hamdu lillah, wa subhan Allah, wa la ilaha illallah, wallahu akbar, wa la hawla wa la quwwata illa billah' (All praise is for Allah; glory be to Allah; there is no god but Allah; Allah is the Greatest; and there is no might nor power except with Allah)." When he had counted them off on his fingers, he said: O Messenger of Allah, these are for my Lord; what should I say for myself? He (peace and blessings be upon him) said: "Say: 'Allahumma ighfir li, warhamni, wahdini, warzuqni, wa 'afini' (O Allah, forgive me, have mercy on me, guide me, provide for me and grant me well-being)." The narrator says: He memorised these words as well, and then went away. The Messenger of Allah (peace and blessings be upon him) said: "This man has filled both his hands with good."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3977