Verse 25. - But are as angels in heaven - not "the angels;" the οἱ is omitted. The blessed, after the resurrection, will be like angels as to purity, as to a spiritual life, as to immortality, as to happiness and glory. There will be no necessity for marriages in heaven. Here, on earth, the father dies, but he lives on in his children after death. In heaven there is no death, but every one will live and be blessed for ever; and therefore it is that St. Luke adds here, "Neither can they die any more." St. Augustine says, "Marriages are on account of children; children on account of succession; succession on account of death. But in heaven, as there is no death, neither is there any marriage."
12:18-27 A right knowledge of the Scripture, as the fountain whence all revealed religion now flows, and the foundation on which it is built, is the best preservative against error. Christ put aside the objection of the Sadducees, who were the scoffing infidels of that day, by setting the doctrine of the future state in a true light. The relation between husband and wife, though appointed in the earthly paradise, will not be known in the heavenly one. It is no wonder if we confuse ourselves with foolish errors, when we form our ideas of the world of spirits by the affairs of this world of sense. It is absurd to think that the living God should be the portion and happiness of a man if he is for ever dead; and therefore it is certain that Abraham's soul exists and acts, though now for a time separate from the body. Those that deny the resurrection greatly err, and ought to be told so. Let us seek to pass through this dying world, with a joyful hope of eternal happiness, and of a glorious resurrection.
they neither marry, nor are given marriage: there will be no such natural relation subsisting, nor any need of any:
but are as the angels which are in heaven; See Gill on Matthew 22:30.