Isaiah 66:3

“He that killeth an ox, is as if he slew a man, &c.] Not that killed the ox of his neighbour, which, according to law, he was to pay for; or that killed one for food, which was lawful to be done; but that slew one, and offered it as a sacrifice; not blamed because blind or lame, or had any blemish in it, and so unfit for sacrifice; or because not rightly offered, under a due sense of sin, and with repentance for it, and faith in Christ; but because all sacrifices of this kind are now abolished in Gospel times, to which this prophecy belongs; Christ the great sacrifice being offered up; and therefore to offer sacrifice, which, notwithstanding the unbelieving Jews continued daily, till it was…”

“God loathes even the sacrifices of the wicked (Isa 1:11; Pro 15:8; Pro 28:9). is as if--LOWTH not so well omits these words: "He that killeth an ox (presently after) murders a man" (as in Eze 23:39). But the omission in the Hebrew of "is as if"--increases the force of the comparison. Human victims were often offered by the heathen. dog's neck--an abomination according to the Jewish law (Deu 23:18); perhaps made so, because dogs were venerated in Egypt. He does not honor this abomination by using the word "sacrifice," but uses the degrading term, "cut off a dog's neck" (Exo 13:13; Exo 34:20). Dogs as unclean are associated with swine (Mat 7:6; Pe2 2:22). oblation--unbloody: in antithesis to…”

“He that killeth an ox is as if he slew a man - Lowth and Noyes render this, ‘He that slayeth an ox, killeth a man.’ This is a literal translation of the Hebrew. Jerome renders it, ‘He who sacrifices an ox is as if (quasi) he slew a man.’ The Septuagint, in a very free translation - such as is common in their version of Isaiah - render it, ‘The wicked man who sacrifices a calf, is as he who kills a dog; and he who offers to me fine flour, it is as the blood of swine.’ Lowth supposes the sense to be, that the most flagitious crimes were united with hypocrisy, and that they who were guilty of the most extreme acts of wickedness at the same time affected great strictness in the performance of…”

“He that, &c. - Solomon, Pro 15:8, gives a full commentary on the whole verse; The sacrifice of the wicked is an abomination to the Lord. As if - From hence it is plain, that the prophet is not here reflecting upon idolatrous worship, but formal worship: upon those who in a formality worshipped the true God, and by acts which he had appointed. God by the prophet declares, that these mens services were no more acceptable to him than murder, idolatry, or the most horrid profanation of his name. Own ways - They live as they lust. Delight - They take pleasure in their sins. Isaiah 66:4”

“66:3 delighting in their detestable sins: Literally delighting in abominations, which refers to pagan worship practices. • sacrifice a bull . . . blessed an idol: Wicked people brought sacrifices as prescribed by the law, but their sin rendered those sacrifices equivalent to pagan offerings (see 1:11-17).”

“killeth: Isa 1:11-15; Pro 15:8, Pro 21:27; Amo 5:21, Amo 5:22 lamb: or, kid cut: Deu 23:18 as if he offered: Isa 66:17, Isa 65:3, Isa 65:4; Deu 14:8 burneth: Heb. maketh a memorial of, Lev 2:2 they have: Isa 65:12; Jdg 5:8, Jdg 10:14 Isaiah 66:4”