How do we know that the promises God made to Abraham are true?

The Bible provides historical testimony to the fulfillment of God's promises to Abraham, particularly in Joshua 21:43-44, where it is affirmed that the Lord gave Israel all the land He swore to their fathers, fulfilling His commitment to Abraham. Furthermore, God's purpose spans both physical and spiritual realms, where the birth of Christ through Abraham's lineage brings eternal significance to the promise of blessing all families through Him, verifying God's faithfulness to His Word.