How do we know Jesus Christ is our substitute?

Jesus Christ fulfills the role of our substitute as He embodies the perfect sacrifice necessary to atone for sin. In the narrative of David and Goliath, David acts as a foreshadowing of Christ, who confronts sin on our behalf. Just as David defeated Goliath, who represents sin and death, Jesus conquered sin through His death and resurrection. Hebrews 4:15 affirms that He was 'tempted in all things as we are, yet without sin.' Because of His perfect obedience and divine nature, He is the suitable Lamb of God, taking on the sins of His people and providing salvation for His sheep.