Adam Clarke on Isaiah 65:4

Which remain among the graves - "For the purpose of evoking the dead. They lodged in desert places that demons might appear to them; for demons do appear in such places, to those who do believe in them." - Kimchi.

In the monuments "In the caverns" - בנצורים bannetsurim, a word of doubtful signification. An ancient MS. has בצורים batstsurim, another בצרים batstsurim, "in the rocks;" and Le Clec thinks the Septuagint had it so in their copy. They render it by εν τοις στηλαιοις, "in the caves."

Which eat swine's flesh - This was expressly forbidden by the law, Lev 11:7, but among the heathen was in principal request in their sacrifices and feasts. Antiochus Epiphanes compelled the Jews to eat swine's flesh, as a full proof of their renouncing their religion, 2 Maccabees 6:18 and 7:1. "And the broth of abominable meats," for lustrations, magical arts, and other superstitious and abominable practices.

In their vessels - For כליהם keleyhem, a MS. had at first בכליהם bichleyhem. So the Vulgate and Chaldee, (and the preposition seems necessary to the sense), "in their vessels."