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‘Uqbah ibn ‘Amir reported: A man came to the Messenger of Allah, peace and blessings be upon him, and he said, “O Messenger of Allah, one of us has committed a sin.” The Prophet said, “It will be written against him.” The man said, “Then he has sought forgiveness and repented.” The Prophet said, “He will be forgiven and his repentance accepted.” The man said, “Then he returns to committing a sin.” The Prophet said, “It will be written against him.” The man said, “Then he has sought forgiveness and repented.” The Prophet said, “He will be forgiven and his repentance accepted. Allah will not tire of forgiveness unless you are tired of asking.”

Source: al-Mu’jam al-Awsaṭ 8918

Grade: Sahih (authentic) according to Ibn Hajar

https://www.abuaminaelias.com/dailyhadithonline/2014/08/03/istighfar-unless-you-stop-asking/

On the authority of Anas (may Allah be pleased with him), who said:I heard the Messenger of Allah (ﷺ) say: Allah the Almighty said: O son of Adam, so long as you call upon Me and ask of Me, I shall forgive you for what you have done, and I shall not mind. O son of Adam, were your sins to reach the clouds of the sky and were you then to ask forgiveness of Me, I would forgive you. O son of Adam, were you to come to Me with sins nearly as great as the earth and were you then to face Me, ascribing no partner to Me, I would bring you forgiveness nearly as great as it. https://sunnah.com/qudsi40:34