Deuteronomy 18:12-14

18:12 Whoever does these things is abhorrent to the Lord and because of these detestable things the Lord your God is about to drive them out from before you. 18:13 You must be blameless before the Lord your God. 18:14 Those nations that you are about to dispossess listen to omen readers and diviners, but the Lord your God has not given you permission to do such things.