25:70Al-Furqaan

Whatever you assert and whatever you call to is indeed good. But if you inform us that there is atonement of our past deeds (then we would embrace Islam). Then it was revealed: And those who call not unto another god along with Allah and slay not any soul which Allah has forbidden except in the cause of justice, nor commit fornication; and he who does this shall meet the requital of sin. Multiplied for him shall be the torment on the Day of Resurrection, and he shall therein abide disgraced, except him who repents a believes and does good deeds. Then these! for the Allah shall change their vices into virtues. Verily Allah is Ever Forgiving, Merciful (xxv. 68-70). Say thou: O my bondsmen woo have committed extravagance against themselves despair not of the Mercy of Allah I Verily Allah will forgive the sins altogether. He is indeed the Forgiving, the Merciful (xxxix. 53).

Some people used to kill, and they did a great deal of it, and they used to commit adultery and they did a great deal of it, and they committed violations. They came to the Prophet and said: "O Muhammad, what you say and call people to is good, if only you could tell us that there is any expiation for what we have done." Then Allah, the Mighty and Sublime, revealed: "And those who invoke not any other ilah (god) along with Allah up to for those, Allah will change their sins into good deeds," he said: "So Allah will change their Shirk into faith, and their adultery into chastity. And the Verse: "Say: O 'Ibadi (My slaves) who have transgressed against themselves (by committing evil deeds and sins)" was revealed.

"The Messenger of Allah said: 'If a person accepts Islam, such that his Islam is good, Allah will decree reward for every good deed that he did before, and every bad deed that he did before will be erased. Then after that will come the reckoning; each good deed will be rewarded ten times up to seven hundred times. And each bad deed will be recorded as it is, unless Allah, the Mighty and Sublime, forgives it.'"

Allah's Messenger (ﷺ) said, "If a person embraces Islam sincerely, then Allah shall forgive all his past sins, and after that starts the settlement of accounts, the reward of his good deeds will be ten times to seven hundred times for each good deed and one evil deed will be recorded as it is unless Allah forgives it."

The verse “And the poets it is those straying in evil who follow them. He (Allah) then abrogated it and made an exception saying: Except those who believe and work righteousness, engage much in the remembrance of Allah."