(v.3) indicate that the people’s religious sacrifices and offerings were only external ritual.
( 1) In their hearts the the people were murderers,
(2) perverts of God’s dietary laws (cf. 65:4; Lev. 11:7),
(3) idolaters,
*** (Isa. 53:6), they were going their own ways, rather than Lord’s ways.
*** Therefore harsh judgment would come.
**** The last 4 lines of 66:4 are almost identical with 65:12; see comments there.)
The Bible Knowledge Commentary (66:3–6)
People in Israel who professed to know the LORD but who actually hated and discriminated against God’s people would be shamed by His discipline when the temple would be destroyed by the Babylonians.
(Isaiah 66:7-11). The Lord to give birth to His nation