Amos 4:5

And offer a sacrifice of thanksgiving with leaven
Which some observe was contrary to the law, which forbids all leaven in a meat offering; or "burning" it in any offering, ( Leviticus 2:11 ) ; which the word ^F20 here used suggests was done by these idolaters, as well as eaten by them, their priests not liking to eat unleavened bread; but; though it was forbidden in the meat offering, was allowed, yea, ordered, with the sacrifice of thanksgiving, ( Leviticus 7:13 ) . So Abarbinel understands it here, as what was according, to law, but ironically commanded to be offered to idols: and proclaim [and] publish the free offerings;
let all know of them when you make your freewill offerings, and invite them to partake of them: for this liketh you, O ye children of Israel, saith the Lord God;
or ye love to offer such sacrifices to your idols, rather than to the Lord God; preferring these to him, and delighting more in the worship of them than of him.

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FOOTNOTES:

F20 (rjq) "incendendo", Munster, Tigurine version; "incendito incensum", Vatablus.