Sunan an-Nasa'i 5522

ʿAmr ibn ʿAli reported to us; he said: Yazid—namely, Ibn Zurayʿ—narrated to us; he said: Husayn al-Muʿallim narrated to us, from ʿAbdullah ibn Buraydah, from Bushayr ibn Kaʿb, from Shaddad ibn Aws, from the Prophet, peace and blessings be upon him, who said: ‘The foremost supplication for forgiveness is for a servant to say: “O Allah, You are my Lord; there is no god but You. You created me, and I am Your servant. I remain true to Your covenant and promise as best I can. I seek refuge in You from the evil of what I have done. I acknowledge to You my sin, and I acknowledge Your blessing upon me, so forgive me, for none forgives sins except You.” If someone says it in the morning, firmly believing in it, and dies, he will enter Paradise; and if he says it in the evening, firmly believing in it, and dies, he will enter Paradise.’ Al-Walid ibn Thaʿlabah differed from him in this report.’