John Wesley on Isaiah 66:3

He that, &c. - Solomon, Prov 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.