“In the resurrection,
They neither marry,
Nor are given in marriage.
But they are like
Angels in heaven.
ἐν γὰρ τῇ ἀναστάσει οὔτε γαμοῦσιν οὔτε γαμίζονται, ἀλλ’ ὡς ἄγγελοι ἐν τῷ οὐρανῷ εἰσιν.
Jesus continued his explanation here in Matthew as in Mark, chapter 12:25, almost word for word, and in Luke, chapter 20:34-36, where there is a longer explanation. Basically, in the afterlife of the resurrection (ἐν γὰρ τῇ ἀναστάσει), there will be no marriage or giving in marriage (οὔτε γαμοῦσιν οὔτε γαμίζονται) because they will all be like angels in heaven (ὡς ἄγγελοι ἐν τῷ οὐρανῷ εἰσιν). Humans will take on an angelic way of life.