66:8At-Tahrim

"While the Messenger of Allah (ﷺ) was returning from Al-Hudaibiyyah it was revealed to him, 'That Allah may forgive you your sins of the past and the future (48:2).' So the Prophet (ﷺ) said: 'An Ayah has been revealed to me which is dearer to me than whatever is upon the earth.' Then the Prophet (ﷺ) recited it for them and they said: 'Congratulations O Messenger of Allah! Allah has explained what He will do with you, but what will He do with us?' So (the following) was revealed: 'That He may admit the believing men and the believing women into Gardens under which rivers flow' up to (His Saying) 'a supreme success (48:5).'"

The Prophet said: "The best of prayers for forgiveness is for a person to say: 'Allahumma, anta rabbi, la ilaha illa anta, khalaqtani wa ana 'abduka, wa ana 'ala 'ahdika wa wa'dika mastata'tu, a'udhu bika min sharri ma sana'tu, abuw'u laka bidhanbi, wa abuw'u laka bini'matika 'alayya faghfirli, fa innahu la yaghfirudh-dhunuba illa anta (O Allah, You are my Lord, there is no god but You. You have created me and I am Your slave and I am keeping my promise and covenant to You as much as I can. I seek refuge with You from the evil of what I do. I acknowledge Your blessing and I acknowledge my sin, so forgive me, for there is none who can forgive sin except You.)' If he says this in the morning, believing in it firmly, and dies on that day before evening comes, he will enter Paradise, and if he says it in the evening, believing firmly in it, and dies before morning comes, he will enter Paradise." Al-Walid bin Tha'labah contradicted him.

The Prophet (ﷺ) said: If anyone says in the morning or in the evening: "O Allah! Thou art my Lord; there is no god but Thee, Thou hast created me, and I am Thy servant and hold to Thy covenant and promise as much as I can; I seek refuge in Thee from the evil of what I have done: I acknowledge Thy favour to me, and I acknowledge my sin; pardon me, for none but Thee pardons sins, and dies during the daytime or during the night." he will go to Paradise.

"We were with 'Abdullah bin 'Umar when he was circumambulating the House; a man came up to him and said: 'O Ibn 'Umar, what did you hear the Messenger of Allah say about the Najwa?' He said: 'I heard the Messenger of Allah say: 'On the Day of Resurrection, the believer will be brought close to his Lord until He will cover him with His screen, then He will make him confess his sins. He will ask him: "Do you confess?" He will say: "O Lord, I confess." This will continue as long as Allah wills, then He will say: "I concealed them for you in the world, and I forgive you for them today." Then he will be given the scroll of his good deeds, or his record, in his right hand. But as for the disbeliever or the hypocrite, (his sins) will be announced before the witnesses.' " (One of the narrators) Khalid said: "At: 'before the witnesses' there is something missing." "These are the ones who lied against their Lord!' No doubt! The curse of Allah is on the wrongdoers."

The Prophet (ﷺ) said "The most superior way of asking for forgiveness from Allah is: 'Allahumma anta Rabbi la ilaha illa anta, Khalaqtani wa ana `Abduka, wa ana `ala `ahdika wa wa`dika mastata`tu, A`udhu bika min Sharri ma sana`tu, abu'u Laka bini`matika `alaiya, wa abu'u laka bidhanbi faghfir lee fa innahu la yaghfiru adhdhunuba illa anta." The Prophet (ﷺ) added. "If somebody recites it during the day with firm faith in it, and dies on the same day before the evening, he will be from the people of Paradise; and if somebody recites it at night with firm faith in it, and dies before the morning, he will be from the people of Paradise."