Ruling on spending money taken without right in building a mosque

The questioner:
He says: Honorable Shaykh, may Allah grant you success, I have money that I took without right, and its amount is four thousand riyals. I know that I do not know the owner of the amount, and after a period of time I paid it to help in building a mosque. Does this clear my conscience? And should I give charity from my salary every month to the owner of this wronged amount?

The Shaykh:
If you do not know its owner, then you spend it in the causes of good, and its reward will be for its owner. And if you paid it for building a mosque, he has the reward in that, and there is no harm. Yes.

The questioner:
We say, Honorable Shaykh, may Allah grant you success, one who endowed some licenses

The Shaykh:
If it is good money from good earnings, as for if it is from evil earnings like riba (usury or interest), and you know that it is riba, do not put it in the mosque. Put it in general projects other than the mosque. Yes.