Ahaz was the worst of all the kings of Judah. He imitated the worst of the Israelite kings - Ahab and Ahaziah - by a re-introduction of the Baal worship, which had been rooted out of Israel by Jehu and out of Judah by Jehoiada.
And made Iris son to pass through the fire - i. e. Ahaz adopted the Moloch worship of the Ammonites and Moabites 2 Kings 3:27; Micah 6:7, and sacrificed at least one son, probably his firstborn, according to the horrid rites of those nations, and the Canaanite tribes Deuteronomy 12:31; Psalms 106:37-38. Hereto, apparently, the Jews had been guiltless of this abomination. They had been warned against it by Moses (marginal reference; Deuteronomy 18:10); and if (as some think) they had practiced it in the wilderness Ezekiel 20:26; Amos 5:26, the sin must have been rare and exceptional; from the date of their entrance into the promised land they had wholly put it away. Now, however, it became so frequent (compare 2 Kings 17:17; 2 Kings 21:6) as to meet with the strongest protest from Jeremiah and Ezekiel (Jeremiah 7:31-32; Jeremiah 19:2-6; Jeremiah 32:35; Ezekiel 16:20; Ezekiel 20:26; Ezekiel 23:37, etc.).