Some singers who enter Islam and become preachers mention their previous sins; is their action correct?

Question:
May Allah reward you, Your Eminence, father. The questioner says: In our country, in America, some singers have embraced Islam and entered the fold of Islam. They have become giving lectures to call the youth to enter Islam and abandon disbelief. However, they sometimes mention in their lectures the sins and transgressions they used to commit in the past. Is their action correct?

Answer:
Their mentioning [of their past] is not correct. As for their calling people, that is good. But as for their mentioning the sins that occurred from them, that is not easy. They repent, and that is enough. They leave them and leave mentioning them, except between themselves and their own souls. They mention them between themselves and their own souls for the sake of regretting them and seeking forgiveness. But mentioning them to people, that may lead the listeners astray, yes.