What is the ruling on a man participating in the construction of a plot of land, when it has become clear that he borrowed from a bank?

The questioner:
We have a plot of land, and a man undertook to build on it for a partnership. It turned out that he borrowed from a bank. Do we allow him to partner with us? We have no connection to where he got the money.

The Shaykh:
Repeat the question.

The questioner:
He says: We have a plot of land, and a man undertook to build on it to partner with us. It turned out that he borrowed from the bank. Do we allow him to partner with us in this land? We have no connection to where he got the money.

The Shaykh:
Well, what do they mean by this construction? Are they building a mosque or what?

The questioner:
It was not clarified.

The Shaykh:
A trading market. In a trading market, you do not take a single share that deals in riba (usury or interest). You do not take anything but good earnings. You do not bring into your partnership anything but good earnings that are not forbidden.