Inasmuch then as the children have partaken of flesh and blood, He Himself likewise shared in the same, that through death He might destroy him who had the power of death, that is, the devil, 15 and release those who through fear of death were all their lifetime subject to bondage. 16 For indeed He does not give aid to angels, but He does give aid to the seed of Abraham. 17 Therefore, in all things He had to be made like His brethren, that He might be a merciful and faithful High Priest in things pertaining to God, to make propitiation for the sins of the people. 18 For in that He Himself has suffered, being tempted, He is able to aid those who are tempted. (Heb 2:14-18, emphasis added)
Jesus is referred to as the singular “seed of Abraham” in the passage below; and it was to Him (Jesus) that the inheritance of Abraham was promised.
Now to Abraham and his Seed were the promises made. He does not say, “And to seeds,” as of many, but as of one, “And to your Seed,” who is Christ. (Gal 3:16)
And if you are Christ’s, then you are Abraham’s seed, and heirs according to the promise. (Gal 3:29)
Even as Abraham believed God and it was accounted to him as righteousness (Gen 15:6), even so all of us today who believe in Jesus as our Savior—apart from the Law—are justified. Therefore, Abraham is the “father” of all who believe. (Rom 4:11-17) See Galatians 3:29 above once more.
Naturally, the “seed of Abraham” also refers to the Hebrew people who descended from Abraham through Isaac. Even more generally, the seed of Abraham could include Arabs, who trace their lineage through Ishmael. This is the physical seed of Abraham. The spiritual seed of Abraham (believers in Jesus Christ) is comprised of people of all nationalities and ethnicities but who have the same Redeemer & Lord.
Being the spiritual seed of Abraham is much more important than being a physical descendant of Abraham when one is considering eternal truths. Jesus reminds us that we must be born again. (Joh 3:3) Those of us who are born again, are Abraham’s seed, and we are guaranteed a lavish inheritance in Him!
. . . giving thanks to the Father who has qualified us to be partakers of the inheritance of the saints in the light. (Col 1:12 – see also Col 3:24, Heb 9:15, 1 Pet 1:3-4)