Galatians 3:15-17 New Testament for Everyone (NTE)
Christ the Seed, Christ the Mediator
15 My brothers and sisters, let me use a human illustration. When someone makes a covenanted will, nobody sets it aside or adds to it. 16 Well, the promises were made ‘to Abraham and his seed’, that is, his family. It doesn’t say ‘his seeds’, as though referring to several families, but indicates a single family by saying ‘and to your seed’, meaning the Messiah.
17 This is what I mean. God made this covenanted will; the law, which came four hundred and thirty years later, can’t undermine it and make the promise null and void.