Isaiah 66:17

“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.
BSB · Berean Standard Bible
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.

Note behind…: or, one after another

KJV · King James Version
“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.
WEB · World English Bible
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.
ASV · American Standard Version

Related passages

From the Treasury of Scripture Knowledge, grouped by the word they explain.

sanctify
Isaiah 1:29; Isaiah 65:3, 4
behind one tree in the midst
or, one after another.eating.
Leviticus 11:2–8; Deuteronomy 14:3–8