Galatians 3 15-16 Passover and Seed of Abraham

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 3:17
And this I say, that the law, which was four hundred and thirty years later, cannot annul the covenant that was confirmed before by God in Christ,[fn] that it should make the promise of no effect.

This study seals with the promise and the 430 years.