Isaiah 66:17

15 For behold, the LORD will come with fire— His chariots are like a whirlwind— to execute His anger with fury and His rebuke with flames of fire.

16 For by fire and by His sword, the LORD will execute judgment on all flesh, and many will be slain by the LORD.

“Those who consecrate and purify themselves to enter the groves—to follow one in the center of those who eat the flesh of swine and vermin and rats—will perish together,” declares the LORD.

18 “And I, knowing their deeds and thoughts, am coming to gather all nations and tongues, and they will come and see My glory.

19 I will establish a sign among them, and I will send survivors from among them to the nations—to Tarshish, Put, and the archers of Lud; to Tubal, Javan, and the islands far away who have not heard of My fame or seen My glory. So they will proclaim My glory among the nations.

This was said to Israel at a particular time, so it is wise to read it together with the surrounding text. Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB
“Those who consecrate and purify themselves to enter the groves—to follow one in the center of those who eat the flesh of swine and vermin and rats—will perish together,” declares the LORD.
KJV
They that sanctify themselves, and purify themselves in the gardens behind one tree in the midst, eating swine’s flesh, and the abomination, and the mouse, shall be consumed together, saith the LORD.
WEB
“Those who sanctify themselves and purify themselves to go to the gardens, following one in the middle, eating pig’s meat, abominable things, and the mouse, they shall come to an end together,” says the LORD.
ASV
They that sanctify themselves and purify themselves [to go] unto the gardens, behind one in the midst, eating swine`s flesh, and the abomination, and the mouse, they shall come to an end together, saith Jehovah.
DARBY
They that sanctify themselves, and purify themselves in the gardens behind one in the midst; that eat swine's flesh, and the abomination, and the mouse, shall perish together, saith Jehovah.
BLB
“The ones consecrating and purifying themselves to the gardens, after one in the center, eating the flesh of swine, and the abomination, and the rodent, together they will come to an end,” a declaration of YHWH.
ÅB
De som helliger og renser seg for havene[^2] etter en som er midt iblant dem[^3], de som spiser svinekjøtt og avskyelige dyr, endog mus, de skal omkomme alle sammen, sier Herren.
OTB
«De som helliger og renser seg for å gå inn i hagene, etter en i midten, som spiser svinekjøtt, avskyelige ting, og mus, vil møte sin ende sammen,» erklærer Herren.
B1930
De som helliger og renser sig for havene efter en som er midt iblandt dem, de som eter svinekjøtt og vederstyggelige dyr, endog mus, de skal omkomme alle sammen, sier Herren. / < JES 65, 3. 4.> / < d.e. deres veiledere, som de retter sig efter.>

Study notes (Tyndale)

Original text and word study

Cross references