Praise be to Allaah Who has guided him to Islam. We ask Allaah to make him steadfast and to guide him to that which is good for him in this world and in the Hereafter.
By His grace and mercy, Allaah has caused Islam to destroy the sins that came before it. When a kaafir becomes Muslim, Allaah forgives all that he did when he was a kaafir, and he becomes cleansed of sin.
Muslim (121) narrated that âAmr ibn al-âAas (may Allaah be pleased with him) said: When Allaah put Islam in my heart, I came to the Prophet (peace and blessings of Allaah be upon him) and said: âGive me your right hand so that I may swear allegiance to you.â He held out his hand and I withdrew my hand. He said, âWhat is the matter, O âAmr?â I said, âI want to stipulate a condition.â He said, âWhat do you want to stipulate?â I said, âThat I will be forgiven.â He said, âDo you not know that Islam destroys that which came before it?â
âIslam destroys that which came before itâ means that it erases it and wipes it out. Stated by al-Nawawi in Sharh Muslim.
Shaykh Ibn âUthaymeen (may Allaah have mercy on him) was asked a similar question, about someone who earned money by dealing in drugs before he became Muslim. He replied:
We say to this brother whom Allaah has blessed with Islam after he had earned haraam wealth: be of good cheer, for this wealth is permissible for him and there is no sin on him in it, whether he keeps it or gives it in charity, or uses it to get married, because Allaah says in His Holy Book (interpretation of the meaning):
âSay to those who have disbelieved, if they cease (from disbelief), their past will be forgiven. But if they return (thereto), then the examples of those (punished) before them have already preceded (as a warning)â
i.e., all that has passed, in general terms, is forgiven. But any money that was taken by force from its owner must be returned to him. But money that was earned by agreements between people, even if it is haraam, like that which is earned through riba or by selling drugs, etc. it is permissible for him when he becomes Muslim because Allaah says, âSay to those who have disbelieved, if they cease (from disbelief), their past will be forgivenâ. And the Prophet (peace and blessings of Allaah be upon him) said to âAmr ibn al-âAas when he became Muslim: âDo you not know that Islam destroys that which came before it?â
Many of the kuffaar became Muslim after they had killed Muslims, but they were not punished for what they had done. So tell this brother that his wealth is permissible and there is no sin in it; he may give it in charity and use it to get married. As for what he has been told about it not being permissible for him to give it in charity, there is no basis for that. End quote.
Liqaaâaat al-Baab il-Maftooh, /373-374.