The principle of faith. He that does these things shall live by them. See Lev 18:5.
Leviticus 18:5
Galatians 3:12 (P)
Judgment on Judah because they sacrificed their sons and daughters in the valley of Hinnom. This was (among many other sins) the reason for the Babylonian captivity of Judah (2 Chronicles 36:16-21).