Prophet Noah - 71:4 "That He may forgive you your sins and postpone you until a certain term. Verily, Allah´s appointed term is not postponed, if you only knew.
Allah forgives the sins of those who honor Him and believe in His messengers and His books and fulfill the requirements of their faith:
The Family Of Imran/3:132 Follow Allah and the messenger that you may be merciful.

Muhammad/47:2 As for those who believe and do righteous deeds and believe in that which has been sent down to Muhammad as a truth from their Lord, He will cover their sins and make them right.

The Cattle/6:155 And this is a blessed Book which We have sent down. So you should follow it and act righteously so that mercy may be shown to you.

The Iron/57:28 O you who have believed, honor Allah and listen to Him and believe in His messenger, so that He may give you two portions of His mercy, and grant you a light in the light of which you will walk, and forgive you. Allah is Forgiving, Merciful.

The Family Of Imran/3:31 "Say, "If you love Allah, follow me so that Allah may love you and forgive you your sins. Allah is Forgiving, Merciful."

Prophet Noah/71:3 Serve Allah and honor Him and follow me.
Prophet Noah/71:4 "That He may forgive you your sins and postpone you until a certain term. Verily, Allah´s appointed term is not postponed, if you only knew.

The Coalition/33:70 O you who believe, honor Allah and speak the truth.
The Coalition/33:71 That He may make your affairs right and forgive you your sins. Whoever follows Allah and His Messenger has won a great victory.

The Sandhills/46:31 O our people, answer him who calls to Allah. Believe in Him that He may forgive you your sins and protect you from a painful torment.

The Cattle/6:104 There has come to you enlightening knowledge from your Lord. Whoever sees is for his own benefit and whoever is blind is for his own loss. I am not a watchman over you.