John Goldingay on Isaiah 66:24

John Goldingay (New International Biblical Commentary)
makes this brief comment about the "burning" mentioned
in Isaiah 66:24:

"The book actually closes (v. 24) with an imaginary
picture of the contrast between the worship of the
temple mount and the nearby burning in the Valley of
Hinnom (see on 30:33; 50:11). While this burning may
go on continually, it is hardly equivalent to the
medieval notion of people suffering the pain of
burning in hell forever" (page 373).