The promises were spoken to Abraham and to his seed. The Scripture does not say, "and to seeds," meaning many, but "and to your seed," meaning One, who is Christ.

Genesis 12:7
Then the LORD appeared to Abram and said, "I will give this land to your offspring." So Abram built an altar there to the LORD, who had appeared to him.

Genesis 17:7
I will establish My covenant as an everlasting covenant between Me and you and your descendants after you, to be your God and the God of your descendants after you.

Genesis 22:18
And through your offspring all nations of the earth will be blessed, because you have obeyed My voice."

Matthew 1:1
This is the record of the genealogy of Jesus Christ, the son of David, the son of Abraham:

Luke 1:55
as He promised to our fathers, to Abraham and his descendants forever."

Acts 3:25
And you are sons of the prophets and of the covenant God made with your fathers when He said to Abraham, 'Through your offspring all the families of the earth will be blessed.'

Romans 4:13
For the promise to Abraham and his offspring that he would be heir of the world was not given through the law, but through the righteousness that comes by faith.

Romans 4:16
Therefore, the promise comes by faith, so that it may rest on grace and may be guaranteed to all Abraham's offspring--not only to those who are of the law, but also to those who are of the faith of Abraham. He is the father of us all.

Romans 9:4
the people of Israel. Theirs is the adoption as sons; theirs the divine glory and the covenants; theirs the giving of the law, the temple worship, and the promises.

2 Corinthians 11:22
Are they Hebrews? So am I. Are they Israelites? So am I. Are they descendants of Abraham? So am I.

Galatians 3:19
Why then was the law given? It was added because of transgressions, until the arrival of the seed to whom the promise referred. It was administered through angels by a mediator.

Now to Abraham and his seed were the promises made. He said not, And to seeds, as of many; but as of one, And to your seed, which is Christ.