Hebrews 9:22 Without the shedding of blood there is no forgiveness of sins.

This truth is shared by all believing Christians.  Jesus died on the cross shedding HIS blood paying the penalty for our sins. HE served as our substitute on the cross. Necessary: Because God says, “Without the shedding of blood there is no forgiveness of sins.” This was true even in the OT, which commanded animal sacrifices necessary for the redemption of man. But now through Jesus shedding HIS blood on the cross all the OT animal sacrifices ended.

Hebrews 9:12 Jesus entered once for all into the holy places (in the heavens), not by animal sacrifices but by the means of HIS OWN BLOOD, securing eternal redemption.

Jesus changed everything.