Eph 2:13-17, Col 1:20-21
In the Old Testament, God said that the coming Christ would bring peace to the Gentiles. (Zec 9:10)
Zec 9:10 And I will cut off the chariot from Ephraim, and the horse from Jerusalem, and the battle bow shall be cut off: and he shall speak peace unto the heathen: and his dominion shall be from sea even to sea, and from the river even to the ends of the earth.
Jesus shed His blood for us on the cross to make us peace with God. That is, Jesus is the Christ who gave us peace as Gentiles, as prophesied in the Old Testament. (Eph 2:13-17, Colossians 1:20-21)
Eph 2:13 But now in Christ Jesus ye who sometimes were far off are made nigh by the blood of Christ. 14 For he is our peace, who hath made both one, and hath broken down the middle wall of partition between us; 15 Having abolished in his flesh the enmity, even the law of commandments contained in ordinances; for to make in himself of twain one new man, so making peace; 16 And that he might reconcile both unto God in one body by the cross, having slain the enmity thereby: 17 And came and preached peace to you which were afar off, and to them that were nigh.
Colossians 1:20 And, having made peace through the blood of his cross, by him to reconcile all things unto himself; by him, I say, whether they be things in earth, or things in heaven. 21 And you, that were sometime alienated and enemies in your mind by wicked works, yet now hath he reconciled