Rom 5:1,10-11, 2 Cor 5:18-19, Acts 10:36, Eph 2:16-18, Col 1:19-20, 1 Jn 2:2, 1 Jn 4:10

God promised to make a covenant of peace with us by sending Christ as the descendant of David. (Ezekiel 37:24-27)

Ezekiel 37:24 And David my servant shall be king over them; and they all shall have one shepherd: they shall also walk in my judgments, and observe my statutes, and do them. 25 And they shall dwell in the land that I have given unto Jacob my servant, wherein your fathers have dwelt; and they shall dwell therein, even they, and their children, and their children's children for ever: and my servant David shall be their prince for ever. 26 Moreover I will make a covenant of peace with them; it shall be an everlasting covenant with them: and I will place them, and multiply them, and will set my sanctuary in the midst of them for evermore. 27 My tabernacle also shall be with them: yea, I will be their God, and they shall be my people.

If we believe in Jesus as the Christ, we will have peace with God. (Romans 5:1,10-11)

Romans 5:1 Therefore being justified by faith, we have peace with God through our Lord Jesus Christ: 10 For if, when we were enemies, we were reconciled to God by the death of his Son, much more, being reconciled, we shall be saved by his life. 11 And not only so, but we also joy in God through our Lord Jesus Christ, by whom we have now received the atonement.

Through Christ Jesus, we have been able to enjoy peace with God, and we have been able to preach the gospel of peace to people. (2 Corinthians 5:18, Acts 10:36, Ephesians 2:16-18, Col 1:19, 1 John 2:2)

2 Corinthians 5:18 And all things are of God, who hath reconciled us to himself by Jesus Christ, and hath given to us the ministry of reconciliation;

Acts 10:36 The word which God sent unto the children of Israel, preaching peace by Jesus Christ: (he is Lord of all:)

Ephesians 2:16 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. 18 For through him we both have access by one Spirit unto the Father.

Col 1:19 For it pleased the Father that in him should all fulness dwell;

1 John 2:2 And he is the propitiation for our sins: and not for ours only, but also for the sins of the whole world.