Deuteronomy 13:3-5

Contemporary English Version

³ If the prophet says this, don't listen! The Lord your God will be watching to find out whether or not you love him with all your heart and soul. ⁴ You must be completely faithful to the Lord. Worship and obey only the Lord and do this with fear and trembling, ⁵ because he rescued you from slavery in Egypt.

If a prophet tells you to disobey the Lord your God and to stop worshiping him, then that prophet is evil and must be put to death.