Settling a debt for the price of a forbidden item, such as wine or a flute

The questioner:
He says: Honorable Shaykh, may Allah grant you success, is it obligatory for a person to settle a debt that was incurred in exchange for a forbidden item, such as someone who took a flute, or tobacco, or took wine for a deferred amount?

The Shaykh:
Repeat the question.

The questioner:
He says: Is it obligatory for a person to settle a debt that was incurred in exchange for a forbidden item, such as someone who took a flute, or tobacco, or took wine for a deferred amount?

The Shaykh:
This is forbidden. This is forbidden. The price of wine, the price of a flute, and the price of musical instruments—this is forbidden. The sale is invalid. These are matters that must be destroyed; they are not money. These must be discarded and destroyed. Yes.

The questioner:
And his Eminence.

The Shaykh:
And if he demands the amount from you, you go to the court with him. The judge sees the truth. Yes.

The questioner:
He says: Honorable Shaykh, may Allah grant you success, is it permissible for a hostile disbeliever to enter the mosque?

The Shaykh:
But I do not know how this question is, since this is the price of wine or a flute? Are you the one who bought the wine or the flute? I do not know. It is not permissible for you to buy wine and buy a flute and then ask about the value. Yes.