Clare - You quoted "propitiation" in Rom.3:24. Let's look at this more precisely:
He was set forth as the ‘propitiation’ (Rom.3:25, Greek: hilasterion—Gk. Septuagint word for the cover over the ark). This word is translated ‘atonement cover’ in the NIV wherever it is used in the O.T. to describe the covering over the ark, as it is also used in Hebrews 9:5. The word is translated ‘mercy seat’ in the NKJ version of the Bible. From above this cover, described in detail in Exodus 25:17-22, between the cherubim, Yahweh spoke to Moses: ‘Now when Moses went into the tabernacle of meeting to speak with Him, he heard the voice of One speaking to him from above the mercy seat that was on the ark of the Testimony, from between the two cherubim; thus He spoke to him’ (Num.7:89, NKJ). This was the cover that was sprinkled with the blood of atonement just once every year, on the Day of Atonement. It was placed in the innermost part of the sanctuary, behind the veil, in the ‘holy of holies’. Jesus, therefore, sprinkled with His own blood, is conveyed as the One in whom and by whom propitiation for us is made possible. The cover was placed above the receptacle of the ark of the covenant, which contained the tablets of the moral Law given by God to Moses, Aaron’s rod and a golden pot of manna (Heb.9:4). This covenant and the Law of the Ten Commandments is what man has violated. ‘All have sinned [Jew and Gentile alike] and fall short of the glory of God’ (Rom.3:23, NKJ). ‘There is none righteous, no, not one’ (Rom.3:10, NKJ). Man’s unrighteousness is the cause of his separation from God (Isa.59:2, NKJ) and the reason for mankind’s need of a Saviour and Advocate: ‘Jesus Christ the righteous. And He Himself is the propitiation for our sins, and not for ours only but also for the whole world’ (1 John 2:1-2, NKJ).
Jesus was the Word of God made flesh (John 1v14). He embodied the righteousness of the commandments that were written on the tablets of stone placed within the ark. Aaron’s rod that budded and bore fruit (Num.17:8), symbolic in one sense of resurrection and new life, placed within the ark, foretold of the Holy One who would say of Himself: ‘I am the resurrection and the life‘ (John 11:25). Jesus is the prophesied Branch of righteousness (Jer.23:5; 33:15), with justice and righteousness as His sceptre (Ps.45:6; Heb.1:8). He is also ‘the true bread from heaven,’ as Jesus said: ‘Moses did not give you the bread from heaven [cf. 'manna', Ex.16:31-33], but My Father gives you the true bread from heaven. For the bread of God is He who comes down from heaven and gives life to the world’ (John 6:32-33, NKJ). Jesus was and is the Holy One of God (John 6:69, NIV; Acts 2:27) upon whom the authority of God rested and rests, symbolized by the mercy seat over the ark. ‘All authority has been given Me in heaven and on earth.’ Jesus said (Matt.28:18, NKJ). As prophesied in the book of Isaiah: ’… the government will be upon His shoulder’ (Isa.9:6, NKJ).
In a spiritual sense, therefore, the ark of God foreshadowed and typified Christ. When He gave His life as an atonement, His blood poured down over the true Mercy Seat of God’s Ark—Himself (Rom.3:25), who is the embodiment of the heavenly bread of God’s Word and Law, and who is the resurrection and the life. He did not do away with the Law, but fulfilled the Law through His own truly righteous life that He poured out in death—thus annulling and bringing to an end the Old Covenant with the physical nation of Israel; while, at the same time, ratifying the New Covenant by His blood with spiritual Israel (Rom.7:1-4; Mat.26:28; 2 Cor.3: 4-9).
J