The Propitiation For Our Sins (1 John 2:1-2)

Christ Our Advocate
¹ My little children, I am writing these things to you so that you may not sin. But if anyone does sin, we have an advocate with the Father, Jesus Christ the righteous. ² He is the propitiation for our sins, and not for ours only but also for the sins of the whole world.

Jesus is our righteous advocate who took the full wrath of the Father for our sin.