Jeremiah 19:5

“They have also built the high places of Baal, etc.] Or, they have even built, etc. and so the words explain what is before suggested of their idolatry; these were the temples in which they placed his image, and the altars on which they sacrificed to him; as follows: to burn their sons with fire, [for] burnt offerings unto Baal; the same idol that is sometimes called Moloch, the names being much of the same signification; the one signifying a “lord” or “master”; the other a king; and to the idol under each name they burned their children with fire, and offered them as burnt offerings unto it; which was a most cruel and barbarous way of sacrificing. Some think they only caused them to pass…”

“commanded not--nay, more, I commanded the opposite (Lev 18:21; see Jer 7:31-32).”

“To burn - This and the following verse, contain another great sin of this people, with the punishment which God proportions to it. The sin in the general was idolatry, but a most barbarous species of it, mentioned also Jer 7:31, Jer 32:35, where it is said, they made their sons and their daughters pass thro' the fire to Molech; the place where they did it is called Tophet, Jer 19:6, of which also mention is made, Isa 30:33. Baal and Molech, signify the same thing; Baal signifies a Lord, Molech a King. Both Baal and Molech seem common names to all idols. Jeremiah 19:7”

“the high: Num 22:41 to burn: Jer 7:31; Deu 12:31; Kg2 17:17; Ch2 28:3; Psa 106:37, Psa 106:38; Eze 16:20, Eze 16:21; Eze 20:26 which: Jer 7:31, Jer 7:32, Jer 32:35; Lev 18:21 neither: Eze 38:10; Dan 2:29 Jeremiah 19:6”