Verse 26 I polluted them in their own gifts - I permitted them to pollute themselves by the offerings which they made to their idols. Causing their children to pass through the fire was one of those pollutions; but, did God ever give them a statute or judgment of this kind? No. He ever inveighs against such things, and they incur his heaviest displeasure and curse. See on Eze 20:31 (note).

Eze 20:26

I polluted them through their own gifts. The noun includes all forms of blessing bestowed on Israel—its corn and wine and oil (see Eze 16:19, Eze 16:20), even its sons and daughters, the fruit of the womb, as well as the increase of the earth. (For the prevalence of Moloch worship, and for the phrase, "pass through," see notes on Eze 16:21.) The sins were to bring desolation as their punishment, and then men would learn to know Jehovah as indeed he is.