Jesus our Good Shepherd became a sheep like one of us except perfectly sinless, so that we could cry out to Him:

Lamb of God, you take away the sins of the world:  have mercy on us.

Lamb of God, you take away the sins of the world:  have mercy on us.

Lamb of God, you take away the sins of the world:  grant us peace.

He is the Passover lamb sacrificed to the Father for our sin.