Is Salaat valid behind an Imaam who wears his pants below the ankles?

Answer

While the Salaat is valid, the sin of the pants below the ankles is a kabeerah sin. Those who wear their trousers in such a haraam manner are under the curse of Allah Ta'ala. Their Salaat is technically valid, but devoid of thawaab. It is not accepted by Allah Ta'ala for reward. Such Salaat is struck onto the face of the faasiq musalli.