John Gill Commentary Amos 4:5

"and offer a sacrifice of thanksgiving of that which is leavened, and proclaim freewill-offerings and publish them: for this pleaseth you, O ye children of Israel, saith the Lord Jehovah." — Amos 4:5 (ASV)

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, yes, 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 likes you, O you children of Israel, says the Lord God ;
or you 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.