Verse 24. - And when her days to be delivered were fulfilled, - literally, and were fulfilled her days to bring forth; ἐπληρώθησαν αἱ ἡμέραι τοῦ τεκεῖν αὐτην (LXX.; cf. Luke 1:57; Luke 2:6). Jarchi accounts for the different phrase used of Thamar (Genesis 38:27), who also bore twins, by supposing that she had not completed her days, but gave birth to Pharez and Zarah in the seventh month (vide Rosenmüller, in loco) - behold, there were twins in her womb (cf. Genesis 38:27, where the full form of the word for twins is given).

25:19-26 Isaac seems not to have been much tried, but to have spent his days in quietness. Jacob and Esau were prayed for; their parents, after being long childless, obtained them by prayer. The fulfilment of God's promise is always sure, yet it is often slow. The faith of believers is tried, their patience exercised, and mercies long waited for are more welcome when they come. Isaac and Rebekah kept in view the promise of all nations being blessed in their posterity, therefore were not only desirous of children, but anxious concerning every thing which seemed to mark their future character. In all our doubts we should inquire of the Lord by prayer. In many of our conflicts with sin and temptation, we may adopt Rebekah's words, If it be so, why am I thus? If a child of God, why so careless or carnal? If not a child of God, why so afraid of, or so burdened with sin?And when her days to be delivered were fulfilled,.... The nine months were up from the time of her conception; or, as the Targum of Jonathan, when the two hundred and seventy days she went with child were completed:

behold, there were twins in her womb; as was perceived by the midwife; a double mercy was granted, more given than asked for; probably only one child was asked for, but two given.