Is it permissible to borrow money from a person whose earnings are not lawful?

Question:
Is it permissible for me to borrow money from a person whose earnings are not lawful?

Answer:
If you know that it is haram (forbidden), it is not permissible for you; it is not permissible for you to borrow from someone whose money is haram. However, if he has both halal (lawful) and haram mixed together, or if you do not know that it is haram but you are doubtful about it, there is no harm in borrowing from him. The Prophet (peace and blessings be upon him) bought food from a Jew, and it is well known that the Jews deal in riba (usury or interest), but not everything they have is riba; they have lawful money and they have unlawful money. But if you know that this money is haram, it is not permissible for you to deal with it, neither by loan nor otherwise. Yes.