I, the LORD, will be their God, and My servant David will be a prince among them. I, the LORD, have spoken.
The prophet has no more to say to the shepherds, but he has now a message to deliver to the flock. God had ordered him to speak tenderly to them, and to assure them of the mercy he had in store for them.
Commenting on Ezekiel 34:17-31
And I will make with them a covenant of peace,...., Such the covenant of grace is, made with Christ from everlasting; in which Jehovah proposed terms of peace, and which Christ undertook to answer, and became the peacemaker; and from this article concerning the peace and reconciliation of men the covenant is so called; see Isa 54:10, this the Lord promises to make known to...
my servant--implying fitness for ruling in the name of God, not pursuing a self-chosen course, as other kings, but acting as the faithful administrator of the will of God; Messiah realized fully this character (Psa 40:7-8; Isa 42:1; Isa 49:3, Isa 49:6; Isa 53:11; Phi 2:7), which David typically and partially represented (Act 13:36); so He is the fittest person to wield the world scepter...