In our OT lexical study we examined kipper and kopher and demonstrated that the meaning of these words is the propitiation of God’s wrath. The Greek word group of hilaskomai, which is the most used Greek word in the LXX and the NT for the kipper word group, also contains the meaning of appeasing God’s wrath rather than expiating of sin.
Four primary sources were consulted: Theological Dictionary of the New Testament, BDAG (Third Edition), New International Dictionary of New Testament Theology (Abridged Edition), and Leon Morris’ The Apostolic Preaching of the Cross.