Dictionary of Theology

This means the turning away of wrath by an offering. It is similar to expiation but expiation does not carry the nuances involving wrath. For the Christian the propitiation was the shed blood of Jesus on the cross. It turned away the wrath of God so that He could pass "over the sins previously committed" (Rom. 3:25). It was the Father who sent the Son to be the propitiation (1 John 4:10) for all (1 John 2:2).