The ruling on eating from the money of a woman whose husband works in a bank, when we do not know whether it is his money or hers

Question:
May Allah reward you. The sister questioner says: My neighbor’s husband works in a bank, and she is an employee. What is the ruling on eating what she sends us? We do not know whether it is from her money or her husband’s money.

Answer:
Money that is mixed with lawful and unlawful contains both lawful and unlawful. It is permissible to eat from it because it is not established that what is eaten is from the unlawful. The default is permissibility. So as long as the money contains lawful and unlawful, there is no harm in eating from it, because it is not established that it is from the unlawful. The Prophet (peace and blessings be upon him) ate from the food of the Jews, and they dealt in riba (usury or interest), because they had sources of permissible income. Yes.