18 For on the one hand there is an annulling of the former commandment because of its weakness and unprofitableness, 19 for the law made nothing perfect; on the other hand, there is the bringing in of a better hope, through which we draw near to God. (Hebrews 7:18–19, NKJV)
The “former commandment” is “the law” given at Mt. Sinai to Israel. God annulled (set aside, abolished) that law because it was powerless to perfect (complete) the one who comes to God. The law served its purpose of identifying sin (Rom. 3:20; Gal. 3:19). It sought to rein in Israel’s sinful conduct by teaching her holiness and the divine blessings that come from obeying God (Deut. 4:13-14; 8:1). But that covenant was temporary and “made nothing perfect” (Gal. 3:19-25). The law did not have the power to redeem souls from sin; it could not save the lost (Heb. 10:1-4, 11). It was a “shadow of the good things to come” in Jesus Christ (Heb. 10:1). Christ and His gospel (not the “former commandment”) bring a better hope to those who draw near to God for forgiveness. We dare not go back to the law of Moses to justify our worship and service to God today. To do so forfeits the grace that is in Christ (Gal. 5:3-4; 1:6-9). Remember, we are not saved by the “shadow” (the first covenant) but by the “substance” of the covenant of Christ (Heb. 10:1-4, 10-12).