1If a prophet or dreamer of dreams arises among you and proclaims a sign or wonder to you,
2and if the sign or wonder he has spoken to you comes about, but he says, “Let us follow other gods (which you have not known) and let us worship them,”
3you must not listen to the words of that prophet or dreamer. For the LORD your God is testing you to find out whether you love Him with all your heart and with all your soul.
4You are to follow the LORD your God and fear Him. Keep His commandments and listen to His voice; serve Him and hold fast to Him.
5Such a prophet or dreamer must be put to death, because he has advocated rebellion against the LORD your God, who brought you out of the land of Egypt and redeemed you from the house of slavery; he has tried to turn you from the way in which the LORD your God has commanded you to walk. So you must purge the evil from among you.
6If your very own brother, or your son or daughter, or the wife you embrace, or your closest friend secretly entices you, saying, “Let us go and worship other gods” (which neither you nor your fathers have known,
7the gods of the peoples around you, whether near or far, whether from one end of the earth or the other),
8you must not yield to him or listen to him. Show him no pity, and do not spare him or shield him.
9Instead, you must surely kill him. Your hand must be the first against him to put him to death, and then the hands of all the people.
10Stone him to death for trying to turn you away from the LORD your God, who brought you out of the land of Egypt, out of the house of slavery.
11Then all Israel will hear and be afraid, and will never again do such a wicked thing among you.
12If, regarding one of the cities the LORD your God is giving you to inhabit, you hear it said
13that wicked men have arisen from among you and have led the people of their city astray, saying, “Let us go and serve other gods” (which you have not known),
14then you must inquire, investigate, and interrogate thoroughly. And if it is established with certainty that this abomination has been committed among you,
15you must surely put the inhabitants of that city to the sword. Devote to destruction all its people and livestock.
— Deuteronomy 13:1-15

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Illustration of Deuteronomy 13:4

Inspirational illustration of Deuteronomy 13:4 --It is the Lord your God you must follow, and him you must revere. Keep his commands and obey him; serve him and hold fast to him.