Why is the story of the brazen serpent significant for Christians?

The brazen serpent, as described in Numbers 21 and referenced by Jesus in John 3:14, serves as a powerful foreshadowing of Christ's atoning sacrifice. Jesus told Nicodemus, 'As Moses lifted up the serpent in the wilderness, even so must the Son of man be lifted up.' This signifies that just as the Israelites were to look at the bronze serpent in faith to be healed from the venomous bites of the serpents, so too must we look to Christ, who was crucified, to find healing from the deadly sting of sin. It emphasizes the theme that salvation is through faith alone in Christ, demonstrating how God provides a remedy for sin through Jesus's sacrificial death.