Deuteronomy 12:29-32

The LORD your God will cut off before you the nations you are about to invade and dispossess. But when you have driven them out and settled in their land, and after they have been destroyed before you, be careful not to be ensnared by inquiring about their gods, saying, “How do these nations serve their gods? We will do the same.” You must not worship the LORD your God in their way, because in worshiping their gods, they do all kinds of detestable things the LORD hates. They even burn their sons and daughters in the fire as sacrifices to their gods. See that you do all I command you; do not add to it or take away from it.