Deuteronomy 13:7

4 But keep on in the ways of the Lord your God, fearing him and keeping his orders and hearing his voice, worshipping him and being true to him.

5 And that prophet or that dreamer of dreams is to be put to death; for his words were said with the purpose of turning you away from the Lord your God, who took you out of the land of Egypt and made you free from the prison-house; and of forcing you out of the way in which the Lord your God has given you orders to go. So you are to put away the evil from among you.

6 If your brother, the son of your mother, or your son or your daughter or the wife of your heart, or the friend who is as dear to you as your life, working on you secretly says to you, Let us go and give worship to other gods, strange to you and to your fathers;

7 Gods of the peoples round about you, near or far, from one end of the earth to the other;

8 Do not be guided by him or give attention to him; have no pity on him or mercy, and give him no cover;

9 But put him to death without question; let your hand be the first stretched out against him to put him to death, and then the hands of all the people.

10 Let him be stoned with stones till he is dead; because it was his purpose to make you false to the Lord your God, who took you out of the land of Egypt, out of the prison-house.