There are many today who would abandon the Old Testament and disregard God's laws as a collection of myths, stories and words that are archaic, and invalid by today's acceptable standards.
All that matter is "love" ... all that matters is "grace" ... all that matters is that Christ died for our sins at Calvary. Beware of this evil lie and deception of the world ... the powers of the air ... our relentless enemy, Satan.
Jesus himself spoke to this directly in Matthew 5:17, "Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfill."
If the Old Testament and God's Laws are invalid, then why would we need Jesus as our a savior. Christ came to redeem us from the wages of sin, as it is written in both the Old and New Testaments, "There is none righteous, no, not one."
The entirety of God's Word, including all of the Old Testament, provides us God's foundations and His amazing grace and mercy given freely through His Son, Jesus Christ.
“Do we then make void the law through faith? God forbid: yea, we establish the law.”
"Being justified freely by his grace through the redemption that is in Christ Jesus: 25 Whom God has set forth to be a propitiation through faith in his blood, to declare his righteousness for the remission of sins that are past, through the forbearance of God"