Shaddad b. Aus reported Allah's Messenger ﷺ as saying that the best manner of asking pardon is to say, “O Allah, Thou art my Lord. There is no Allah 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.” He said that if anyone says it during the day-time with firm belief in it and dies that day before evening, he will be one of those who go to paradise; and if anyone says it during the night with firm belief in it and dies before morning, he will be one of those who go to paradise. Bukhari transmitted it.