'Holy' in the Bible

The captain of the Lord’s host said to Joshua, “Remove your sandals from your feet, for the place where you are standing is holy.” And Joshua did so.

But all the silver and gold and articles of bronze and iron are holy to the Lord; they shall go into the treasury of the Lord.”

Then Joshua said to the people, “You will not be able to serve the Lord, for He is a holy God. He is a jealous God; He will not forgive your transgression or your sins.