Sunan Ibn Majah Book 34, Hadith 10
"The Messenger of Allah (saas) came out to us, leaning on a stick, and when we saw him we stood up. He said: 'Do not do what the Persians do for their leaders.' We said: 'O Messenger of Allah, why don't you pray to Allah for us?' He said: 'Allahummaghfirlana, warhamna, warda 'anna, wa taqabbal minna, wa adkhilnal-jannah, wa najjina minan-nar, wa aslih lana sha'nana kullah. .' It was as if we wanted him to say more, but he said: 'Have I not summed everything for you?'"
he said to the Messenger of Allah (saas): "Teach me a supplication which I can say during my prayer." He said: "Say: Allahumma inni zalamtu nafsi zulman kathiran wa la yaghfirudh-dhunub illa Anta, faghfirli maghfiratan min 'indika warhamni, innaka Antal-Ghafurur-Rahim (O Allah, I have wronged myself greatly and no one forgives sins but You, so grant me forgiveness from You and have mercy on me, for You are the Oft-Forgiving, Most Merciful)."
'Allahumma! Inni a'udhu bika minal-arba': min 'ilmin la yanfa'u, wa min qalbin la yakhsha'u, wa min nafsin la tashba'u, wa min du'a'in la yusma' .'"