Charles Spurgeon Commentary Galatians 3:16-17

"Now to Abraham were the promises spoken, and to his seed. He saith not, And to seeds, as of many; but as of one, And to thy seed, which is Christ. Now this I say: A covenant confirmed beforehand by God, the law, which came four hundred and thirty years after, doth not disannul, so as to make the promise of none effect." — Galatians 3:16-17 (ASV)

Now to Abraham and his seed were the promises made. He saith not, And to seeds, as of many; but as of one, And to thy seed, which is Christ. And this I say, that the covenant, that was confirmed before of God in Christ, the law, which was four hundred and thirty years after, cannot disannul, that it should make the promise of none effect.

This is sound reasoning. God made a covenant with Abraham, and said that in him and in his seed all nations should be blessed. All believers are in Christ, who is here called Abraham's seed, and therefore they must be blessed. Whatever the law may say or may not say, it was not given until years after the covenant was made with Abraham, and therefore cannot affect it in any way.

Now to Abraham and his seed were the promises made. He saith not, And to seeds, as of many; but as of one, And to thy seed, which is Christ. And this I say, that the covenant, that was confirmed before of God in Christ, the law, which was four hundred and thirty years after, cannot disannul, that it should make the promise of none effect.

That is clear enough. The covenant made with Abraham and his seed cannot be affected by anything that was said or done on Sinai.

Whatever the covenant of works may be, or say, or do, it comes in more than four centuries after this glorious covenant of grace had been signed, sealed, and ratified; and therefore it cannot be affected, it must stand firm forever.