The Promises of God: Saints: Heirs of

And if you belong to Christ, then you are Abraham’s seed and heirs according to the promise.

So when God wanted to make the unchanging nature of His purpose very clear to the heirs of the promise, He guaranteed it with an oath.

By faith he dwelt in the promised land as a stranger in a foreign country. He lived in tents, as did Isaac and Jacob, who were heirs with him of the same promise.