Isa 53:10-11, Jn 3:16, Acts 5:30-31, Rom 8:3-4, Gal 2:16
No one can be justified by the law of Moses. But those who believe in Jesus as the Christ receive forgiveness of sins and are justified. (Acts 13:38-39, Gal 2:16)
Acts 13:38 Be it known unto you therefore, men and brethren, that through this man is preached unto you the forgiveness of sins: 39 And by him all that believe are justified from all things, from which ye could not be justified by the law of Moses.
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.
The Old Testament prophesied that Christ would die to bear our sins. (Isa 53:10-11)
Isa 53:10 Yet it pleased the Lord to bruise him; he hath put him to grief: when thou shalt make his soul an offering for sin, he shall see his seed, he shall prolong his days, and the pleasure of the Lord shall prosper in his hand. 11 He shall see of the travail of his soul, and shall be satisfied: by his knowledge shall my righteous servant justify many; for he shall bear their iniquities.
God showed us that Jesus was the Christ by raising Jesus to life. And God forgave the sins of those who believed in Jesus as the Christ. (Acts 5:30-31)
Acts 5:30 The God of our fathers raised up Jesus, whom ye slew and hanged on a tree. 31 Him hath God exalted with his right hand to be a Prince and a Saviour, for to give repentance to Israel, and forgiveness of sins.
God made Jesus bear our sins and forgave us. (Rom 8:3-4)
Rom 8:3 For what the law could not do, in that it was weak through the flesh, God sending his own Son in the likeness of sinful flesh, and for sin, condemned sin in the flesh: 4 That the righteousness of the law might be fulfilled in us, who walk not after the flesh, but after the Spirit.