Because of the negative situation of God’s people, as portrayed in chs. 11—15, according to God’s concept and in His divine economy there is the need of redemption. Because the Old Testament time was not the time for redemption to take place, a type, a shadow, of the coming redemption was needed. This shadow is the expiation in this chapter. The expiation accomplished through the animal sacrifices in the Old Testament is a type pointing to the redemption accomplished by Christ in the New Testament.
The root of the Hebrew word translated expiation means to cover. The noun form of this word is rendered expiation cover in v. 2 and in Exo. 25:17. The root of the Greek word used in the Septuagint and in the New Testament, translated propitiation in Rom. 3:25; Heb. 2:17 and 1 John 2:2 and 1 John 4:10, means to appease (the situation between two parties). On the Day of Expiation the blood of the sin offering was brought into the Holy of Holies and sprinkled on the expiation cover, the lid of the Ark (vv. 14-15), which covered the Ten Commandments within the Ark (Exo. 25:16), signifying that the sin of the ones coming to contact God had been covered but not yet removed (see note Heb. 1:33). In this way the situation of fallen man in relation to God was appeased but was not fully settled, until Christ came to accomplish redemption by offering Himself as the propitiatory sacrifice to take away man’s sin (Heb. 9:12; 2:17; 1 John 2:2; 4:10; John 1:29). See note Rom. 3:252a and note Rom. 3:253, note Heb. 2:174d, note Heb. 9:122, and note 1 John 2:21a.