Adam Clarke's Bible Commentary Verse 4. I will make thy seed-as the stars of heaven] A promise often repeated to Abraham, and which has been most amply fulfilled both in its literal and spiritual sense.
Matthew Henry Commentary
Verses 1-5 - Isaac had been trained up in a believing dependence upon the Divin grant of the land of Canaan to him and his heirs; and now that there is a famine in the land, Isaac still cleaves to the covenant. The rea worth of God's promises cannot be lessened to a believer by any cros providences that may befall him. If God engage to be with us, and we are where he would have us to be, nothing but our own unbelief an distrust can prevent our comfort. The obedience of Abraham to the Divine command, was evidence of that faith, whereby, as a sinner, he was justified before God, and the effect of that love whereby tru faith works. God testifies that he approved this obedience, to encourage others, especially Isaac.
Original Hebrew והרביתי7235 את853 זרעך2233 ככוכבי3556 השׁמים8064 ונתתי5414 לזרעך2233 את853 כל3605 הארצת776 האל411 והתברכו1288 בזרעך2233 כל3605 גויי1471 הארץ׃776