A: We tell them that the doors of repentance are open. It is obligatory on the person who deviated from the truth to return to it. They should repent to Allah (Exalted be He), regret their mistakes and return to guidance and truth. Allah (Exalted be He) will erase their past errors and misguidance by virtue of their repentance. Allah (Glorified and Exalted be He) says, And all of you beg Allâh to forgive you all, O believers, that you may be successful Allah (may He be Praised) says, O you who believe! Turn to Allâh with sincere repentance! The Prophet (peace be upon him) said, He who repents from his sins is like the one who did not commit a sin.
Sincere repentance comprises three matters: First, regretting the mistake, error, oppression and aggression committed. Second, giving up the sin and avoiding it hoping for Allah's reward out of glorifying Him. Third, strong determination not to commit it again out of sincerity to Allah (Exalted be He), and loving and glorifying Him. There is a fourth condition, which is also necessary with respect to the rights of humans. In other words, a person should rid himself of the oppression he committed against people's money, blood and honor. In this category, for a person to repent he must return what he illegally took or ask forgiveness of the oppressed.
When these conditions are fulfilled hoping for Allah's reward and glorifying Him, Allah (Exalted be He) accepts repentance and wipes out sins. Speaking about the disbelievers, Allah (Exalted be He) says, Say to those who have disbelieved, if they cease (from disbelief), their past will be forgiven. Allah (may He be Praised) addresses all people, saying, Say: "O 'Ibâdî (My slaves) who have transgressed against themselves (by committing evil deeds and sins)! Despair not of the Mercy of Allâh: verily, Allâh forgives all sins. Truly He is OftForgiving, Most Merciful. Scholars unanimously agreed that this Ayah (Qur'anic verse) addresses the repentant person.