Al-Adab Al-Mufrad #619

Shaddad ibn Aws reported that the Prophet, may Allah bless him and grant him peace, said, "The best way of asking forgiveness is 'O Allah, You are my Lord. There is no god but You. You created me and I am Your slave. I follow Your covenant and promise as much as I can. I acknowledge Your blessing and I confess to my wrong actions, so forgive me. Only You can forgive wrong actions. I seek refuge with You from the evil of what I have done.' If he says it in the evening and then dies, he will enter the Garden - or he said that he will be one of the people of the Garden. If he says it in the morning and dies that day - it is the same."