One of the shadow-like characteristics of the law was contained in its sacrifices. ”For the law having a shadow of the good things to come and not the very image of the things, can never with these same sacrifices which they offer continually year by year,” Christ would perfectly fulfil all that those ancient sacrifices pictured, and He would make all of their desired benefits fully available to all who would believe in Him. This call to righteousness can only become a substaintial realty through the Lord Jesus Christ,” that I may gain Christ and be found in Him, not having my own righteousness, which is from the law but that which is through faith in Christ, the righteousness which is from God by faith”(ref, Phil 3*8-9).
Another better aspect of grace is the difference between the substance and shadow, Shadows supply various benefits, but they have critical limitations. shadows can provide a visible outline of a actual reality, but they cannot supply what is inherent to the reality, shadows gives indication of a n approaching person, but they cannot provide a relationship with that person, the old covenant of law is likened unto a shadow of the good things to come. but the reality belong to Christ.(ref, Col 2*17).
This shadow of temporal deliverance becomes substance in Christ, who delivers us from eternal judgement, JESUS CHRIST, OUR PASSOVER WAS SACRIFICED FOR US.