New Defender's Study Bible Notes
13:6 serve other gods. The penalty in theocratic Israel for spiritual seduction to other gods than the true God was death by stoning (Deuteronomy 13:10), even if the guilty person was one’s closest and dearest friend or relative. To the modern mind, this command sounds extreme and unwarranted, but if it had been obeyed Israel would never have turned away from God and the whole course of world history would have been different.
13:11 any such wickedness. While rejecting the true God of creation is not a capital crime in our Christian economy, these verses do show quite graphically how God feels about people today who commit the same sort of sacrilege, such as worshipping the great “god” Chance in evolutionism or the earth “goddess” Gaia in various “new-age “religions.
13:13 children of Belial. This is the first use of the epithet “Belial” in the Bible. See note on Judges 19:22.