What does the Bible say about God's unconditional covenant with Abraham?

In Joshua 24, it is emphasized that God made an unconditional covenant with Abraham, demonstrating His sovereign choice in salvation. As stated, Abraham was chosen and justified even while he was an idolater, illustrating that salvation comes not from human merit but solely through God's grace. This covenant serves not just as a historical marker but also as a theological foundation for understanding God's salvific plan, which culminates in Christ, who fulfills all promises of redemption. Romans 4 highlights that Abraham serves as a supremely important example of how God justifies the ungodly, securing righteousness through faith rather than works.