How do we know that Jesus fulfilled the role of priest?

In Hebrews 10:14, it is stated that by one offering, Jesus has perfected forever those who are sanctified, demonstrating His role as the ultimate high priest. Unlike the Levitical priests who repeated sacrifices, Christ's self-offering was once for all, securing eternal redemption. This is pivotal for understanding our relationship with God, as it affirms that through faith in Christ, we are reconciled and have direct access to the Father. His priestly role encapsulates His compassion, willingness to suffer, and the provision of grace and mercy for all who believe.