1. The law that leads us to Christ (Lev 26:46)
    Gal 3:19-24, Gal 4:4-5, Rom 11:32, Acts 13:39, Rom 10:4, Gal 2:16,21, Acts 10:43, Gal 3:11, Heb 9:10-12

In the Old Testament, God made rules and laws through Moses. (Lev 26:46)

Lev 26:46 These are the statutes and judgments and laws, which the Lord made between him and the children of Israel in mount Sinai by the hand of Moses.

The law convicts us of sin and leads us to Christ. (Gal 3:19-24)

Gal 3:19 Wherefore then serveth the law? It was added because of transgressions, till the seed should come to whom the promise was made; and it was ordained by angels in the hand of a mediator.
20 Now a mediator is not a mediator of one, but God is one.
21 Is the law then against the promises of God? God forbid: for if there had been a law given which could have given life, verily righteousness should have been by the law.
22 But the scripture hath concluded all under sin, that the promise by faith of Jesus Christ might be given to them that believe.
23 But before faith came, we were kept under the law, shut up unto the faith which should afterwards be revealed.
24 Wherefore the law was our schoolmaster to bring us unto Christ, that we might be justified by faith.

God made it impossible for human beings to keep all the law, so that they could be justified through Christ. (Rom 11:32, Acts 13:39)

Rom 11:32 For God hath concluded them all in unbelief, that he might have mercy upon all.

Acts 13:39 And by him all that believe are justified from all things, from which ye could not be justified by the law of Moses.

Jesus was born under the law and became the end of the law to achieve righteousness for all who believe in Jesus as the Christ. (Galatians 4:4-5, Romans 10:4)

Galatians 4:4 But when the fulness of the time was come, God sent forth his Son, made of a woman, made under the law,
5 To redeem them that were under the law, that we might receive the adoption of sons.

Romans 10:4 For Christ is the end of the law for righteousness to every one that believeth.

No one can be justified by keeping the law. A person is justified by believing in Jesus as the Christ. (Gal 2:16, 21)

Gal 2:16 Knowing that a man is not justified by the works of the law, but by the faith of Jesus Christ, even we have believed in Jesus Christ, that we might be justified by the faith of Christ, and not by the works of the law: for by the works of the law shall no flesh be justified.
21 I do not frustrate the grace of God: for if righteousness come by the law, then Christ is dead in vain.

The prophets of the Old Testament also say that people receive the forgiveness of sins by believing in Christ. (Acts 10:43, Gal 3:11)

Acts 10:43 To him give all the prophets witness, that through his name whosoever believeth in him shall receive remission of sins.

Gal 3:11 But that no man is justified by the law in the sight of God, it is evident: for, The just shall live by faith.

God has entrusted the law to us only until Christ comes. Jesus, the Christ, fulfilled that law by working for us an eternal atonement with His blood. (Hebrews 9:10-12)

Hebrews 9:10 Which stood only in meats and drinks, and divers washings, and carnal ordinances, imposed on them until the time of reformation.
11 But Christ being come an high priest of good things to come, by a greater and more perfect tabernacle, not made with hands, that is to say, not of this building;
12 Neither by the blood of goats and calves, but by his own blood he entered in once into the holy place, having obtained eternal redemption for us.