Say: ‘O ‘Ibaadi (My slaves) who have transgressed against themselves (by committing evil deeds and sins)!
Despair not of the Mercy of Allaah, verily, Allaah forgives all sins. Truly, He is Oft‑Forgiving, Most Merciful’”
[Zumar 39:53]
If a person commits a sin, then says, ‘O Lord, I have committed a sin so forgive me,’ He says, ‘My slave knows that he has a Lord Who may forgive sins or punish for it; I have forgiven My slave…
[Bukhari 6953]
Verily, the good deeds remove the evil deeds (i.e. small sins)”
[Hud:114]
“The five prayers, Friday to Friday, and Ramadan to Ramadan will expiate the sins committed between them, as long as major sins are avoided.”
[Muslim 233]
Whoever observes fasts during the month of Ramadan out of sincere faith, and hoping to attain Allah's rewards, then all his past sins will be forgiven.
[Bukhari 31]
“Whoever spends the night of Laylat al-Qadr in prayer out of faith and the hope of reward, his previous sins will be forgiven.”
[Nasai 5027]
The Prophet, peace and blessings be upon him, was asked about fasting the day of Arafat and he said, “It will expiate the sins of the previous and upcoming years.”
[Muslim 1162]
Then, the Prophet was asked about fasting the day of Ashura and he said, “It will expiate the sins of the past year.”
[Muslim 1162]
Whoever performs pilgrimage to this House and does not behave in an obscene or immoral manner will return free of sin like the day his mother gave birth to him.
[Tirmidhi 811]
When a Muslim or believer washes his face in ablution, every sin committed with his eyes will be washed away with the last drop of water. When he washes his hands, every sin committed with his hands will be washed away with the last drop of water...
[Muslim 244]
When the servant stands to pray, all his sins are taken and placed on his head and shoulders. Every time he bows or prostrates, the sins fall away.”
[Ibn Hibban 1769]
When it is the last third of the night, our Lord; the Blessed; the Superior, descends every night to the heaven of the world and says, “Is there anyone who invokes Me (demands anything from Me), that I may respond to his invocation...
[Bukhari 6321]
Two Muslims will not meet and shake hands except their sins are forgiven before they separate.
[Abu Dawud 5212]
Charity extinguishes sin just as water extinguishes fire
[Tirmidhi 614]
Whoever continuously performs the two rak’āh of Ad-Duha will have his sins forgiven, even if they are like the foam of the sea.
[Tirmidhi 476]
And he who utters ‘subhānAllāhi wa bihamdihi (Glory be to Allāh and His is the Praise)’ one hundred times during the day, his sins are wiped away even if they are like the foam of the sea.
[bukhari 1408]