Praying in a ritually impure place with a pure cloth placed for prostration

The questioner:
Honorable Shaykh! If a person prays in a place that contains ritual impurity, and he has placed a pure piece of cloth where he prostrates, while standing with his feet on the impure place, what is the ruling on his prayer?

The Shaykh:
His prayer is not valid if he stands on an impure place and prostrates on a pure place. This is not sufficient. It is necessary that every place of his prayer—every place of his prayer—be pure: the place where he stands, the place where he sits, and the place where he prostrates must all be a pure area, the whole of it. As for if part of the area is pure and part is impure, his prayer is not valid. Yes.

The questioner:
And what is the ruling if he turns around?

The Shaykh:
If the ground is impure and a pure mat is spread over it, and he prays, his prayer is valid. Yes.