Galatians 3:29

Abraham’s seed. As a son of Abraham, Christ became, in a special sense, heir to the covenant promises (see on v. 16). By baptism we acquire kinship to Christ, and through Him acquire the right to participate in the promises made to Abraham (vs. 7-9). Concerning the importance attached by the Jews to literal descent from Abraham see on Matt. 3:9; Rom. 9:4.

Heirs. As spiritual children of Abraham, Christians become “joint-heirs with Christ” (Rom. 8:17). As Son of God, Christ is likewise heir to the honor and glory of heaven, and those who believe in Him fall heir to a position of honor in the universe that would never have been possible for created beings to enjoy had the Word not become flesh (John 1:1, 14). At the incarnation, divinity and humanity were united by ties never to be broken (DA 21, 25, 26). As heirs with Abraham to the covenant promises, all who emulate his lofty example of faith will enter the “city which hath foundations,” to which he himself ever looked forward in faith (Heb. 11:10). See on Gal. 3:9, 14.

The promise. That is, the “promise” of God to Abraham to justify both Jews and Gentiles on the basis of faith alone, without the “works” of “the law” (see on vs. 8, 14, 16).