Why is Rahab considered part of the genealogy of Christ?

Rahab’s inclusion in the genealogy of Christ (Matthew 1:5) serves as a powerful testament to the grace and redemption that God extends to sinful humanity. Despite her background as a harlot, she became the mother of Boaz, who married Ruth, and they ultimately became ancestors of David and Jesus. This illustrates the truth that God's saving grace transcends societal boundaries and redeems those in desperate need, fulfilling the Reformed belief that God’s mercy is available to all who believe, regardless of their past.