Eating from the slaughtered animals and money of one who has received money containing riba

Question:
He says: Honorable Shaykh, may Allah grant you success, a man has received money that contains riba. Is it permissible for us to eat from his slaughtered animals and what he serves us from his home?

Answer:
The rule is that for one whose wealth is mixed with lawful and unlawful, the default is that it is lawful, so you eat from it, unless you know that this food is from the unlawful, in which case you do not eat from it. But if you do not know, the default is that it is lawful. The Prophet (peace and blessings be upon him) used to eat from the food of the Jews, even though they dealt in riba, but not all the wealth of the Jews is from riba; it is not all forbidden. Yes.