Albert Barnes Commentary Ezekiel 23:37

"For they have committed adultery, and blood is in their hands; and with their idols have they committed adultery; and they have also caused their sons, whom they bare unto me, to pass through [the fire] unto them to be devoured." — Ezekiel 23:37 (ASV)

Blood - One of the chief sins of Manasseh was that he shed innocent blood (2 Kings 21:16; 2 Kings 24:4).