who sit in tombs, and spend the night in secret places; who eat pig’s flesh, and broth of tainted meat is in their vessels;
The apostle Paul (an expositor we may depend upon) has given us the true sense of these verses, and told us what was the event they pointed at and were fulfilled in, namely, the calling in of the Gentiles and the rejection of the Jews, by the preaching of the gospel, Rom 10:20, Rom 10:21.
Commenting on Isaiah 65:1-7
Which remain among the graves,.... In order to practise necromancy, to consult the dead, where they imagined demons and departed spirits haunted, and of whom they fancied they might get knowledge of future things: and lodge in the monuments: whole nights for the same purposes.
remain among . . . graves--namely, for purposes of necromancy, as if to hold converse with the dead (Isa 8:19-20; compare Mar 5:3); or, for the sake of purifications, usually performed at night among sepulchres, to appease the manes [MAURER].