Deuteronomy 12:29-31

29“When Adonai your God cuts off before you the nations that you are going in to dispossess, when you have dispossessed them and settled in their land,

30be careful not to be trapped into imitating them after they have been destroyed before you. Do not inquire about their gods, saying, ‘How do these nations serve their gods? I will do the same.’

31You are not to act like this toward Adonai your God! For every abomination of Adonai, which He hates, they have done to their gods—they even burn their sons and daughters in the fire to their gods.