Isa 53:5,10, Jn 1:29, Heb 9:26

In the Old Testament, the Israelites offered trespass offerings to God in order to have their sins forgiven. (Lev 5:15)

Lev 5:15 If a soul commit a trespass, and sin through ignorance, in the holy things of the Lord; then he shall bring for his trespass unto the Lord a ram without blemish out of the flocks, with thy estimation by shekels of silver, after the shekel of the sanctuary, for a trespass offering.

The Old Testament prophesied that Christ would become a trespass offering to God in order to forgive our transgressions. (Isa 53:5,10)

Isa 53:5 But he was wounded for our transgressions, he was bruised for our iniquities: the chastisement of our peace was upon him; and with his stripes we are healed. 10 Yet it pleased the Lord to bruise him; he hath put him to grief: when thou shalt make his soul an offering for sin, he shall see his seed, he shall prolong his days, and the pleasure of the Lord shall prosper in his hand.

Jesus is the Lamb of God who took away our sins. (John 1:29)

John 1:29 The next day John seeth Jesus coming unto him, and saith, Behold the Lamb of God, which taketh away the sin of the world.

Jesus offered himself as a sacrifice to God once for the forgiveness of our sins. (Heb 9:26)

Heb 9:26 For then must he often have suffered since the foundation of the world: but now once in the end of the world hath he appeared to put away sin by the sacrifice of himself.