Heaven and earth shall pass away,.... This is either an assertion, which will be true at the end of time; not as to the substance of the heavens and earth, which will always remain, but as to the qualities of them, which will be altered: they will be renewed and refined, but not destroyed; the bad qualities, or evil circumstances, which attend them through the sin of man, will be removed and pass away, but they themselves will continue in being: or is a comparative expression, and the sense is, that the heavens and the earth, and the ordinances thereof, than which nothing can be more firm and strong, being fixed and supported by God himself, shall sooner pass away, than anything asserted and predicted by Christ shall:

but my words shall not pass away; be vain and empty, and unaccomplished; which is true of anything, and everything spoken by Christ; and especially here regards all that he had said concerning the calamities that should befall the Jews, before, at, or upon the destruction of their nation, city, and temple; and the design of the expression, is to show the certainty, unalterableness, and sure accomplishment of these things; see Jer 31:36.