How do we know the doctrine of God's covenant promise is true?

The doctrine of God's covenant promises is affirmed throughout the Bible, highlighting His commitment to His people. Joseph's story serves as a pivotal example, where he reassures his brothers that God's purpose in their suffering was ultimately for saving not just them, but also their descendants (Genesis 45:7). The covenant made with Abraham, Isaac, and Jacob includes promises of preservation and blessing that stretch beyond their lifetimes, culminating in the coming of the Messiah through their lineage. This ongoing fulfillment of God's promises, seen in biblical history and personal faith experiences, substantiates their truthfulness and reliability. In light of the New Testament, these promises are fully realized in Jesus Christ, underscoring the faithfulness of God to His word.