Charles Ellicott Commentary Numbers 25:12

"Wherefore say, Behold, I give unto him my covenant of peace:" — Numbers 25:12 (ASV)

My covenant of peace.— Phinehas, as one who was zealous for the honor of God and of the house of the Lord, was a fitting type of Christ, in whom the prediction of the Psalmist received its accomplishment, The zeal of thine house hath eaten me up (Psalms 69:9; John 2:17). The covenant of grace is described in Isaiah 54:10 and in Malachi 2:5 as the covenant of peace.