II Timothy 3:16 says "All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness." With that being said, all books in the bible are of equal worth.
The Old Testament is Jesus concealed & the New Testament is Jesus revealed. The Old Testament is our "schoolmaster" to brings us "unto Christ!" However, once "in Christ," we no longer need a "schoolmaster." Galatians 3:24-25 says "Wherefore, the law was our "schoolmaster" to bring us "unto Christ," that we might be justified by faith. (v25) But after faith is come, we are no longer under a "schoolmaster."
There are different dispensations in the bible and we currently live under the New Covenant (Grace and Truth)! Religion would have us believe that we must live under the Old Covenant, but that is not what Scripture says! God spoke through the Prophet Jeremiah in the days of old (Jer. 31:33) saying "But this shall be "the covenant" that I will make with the house of Israel: "After those days" (after His resurrection), saith the Lord, I will put my law in their inward parts,and write them in their hearts..." Again in Hebrews 8:10 and 10:16, He said the same thing. In John 14:26 and in John 16:13, Jesus "promised" us a "Comforter" (Spirit of Truth/The Holy Spirit) that would teach and guide us into "all" truth. The "promise" was fulfilled in Acts on The Day of Pentecost (Acts 2:2). Afterward, the Holy Spirit began "putting His laws in the apostle's minds and hearts," telling them what to tell the people also writing the remainder of the New Testament!
The "First Church" was established in Acts and that's where we should live today for Holy Spirit (Jesus) guides and teaches us as said in Jeremiah & Hebrews!
Galatians 3:12 says "And the law is not of faith, but, The man that doeth them shall live in them." James 2:10 says "For whosoever shall keep the whole law, and yet offend in one point, he is guilty of all." Galatians 3: 13 says "Christ has redeemed us from the curse of the law, being made a curse for us; for it is written, Cursed is everyone that hangeth on a tree." In the allegory in Galatians 4, it says that we cannot live under both the Old Covenant and the New Covenant. Who would want to when James said if we "offend in point, we are guilty of all?"
The Holy Spirit "Far Exceeds" the law! He's with us continuously! It is not what "we do" but what "He has done" for "It is finished!"