Isaiah 66:3
Whoever slaughters an ox is like one who slays a man;
What it says
Sacrifices offered by those who choose evil are treated as morally polluted and idolatrous.
What it is doing
This verse exposes the worthlessness of ritual divorced from obedience.
In context
1This is what the LORD says: 2Has not My hand made all these things? 3Whoever slaughters an ox is like one who slays a man; 4So I will choose their punishment 5You who tremble at His word, 6Hear the uproar from the city;