How do we know that Christ's sacrifice makes us holy?

In Hebrews 10:14, it is stated that by one offering, Christ has perfected forever those who are sanctified. This underscores the idea that through Christ's sacrificial death, He not only accomplished the act of atonement for sins but also imparted holiness to His people. The presentation of Christ to the Lord after His birth signifies His role as the Holy One, which leads to the sanctification of those who believe. Through faith in Him, believers are set apart, declared holy, and their sins are purified, as affirmed in the overarching narrative of Scripture that highlights God's work of redemption and regeneration in His elect.