Ezekiel 34:23
And I will set up one shepherd over them, and he shall feed them, even my servant David; he shall feed them, and he shall be their shepherd. And I will set up one shepherd over them, and he shall feed them, even my servant David; he shall feed them, and he shall be their shepherd.
The promise comes as part of a rebuke of unfaithful shepherds, because the shepherds of Israel had failed in their duty to care for the flock. God promises to save His flock so they shall be no more a prey, to judge between cattle and cattle, and to set up one shepherd over them to feed them and to be their shepherd. This belongs to a covenant of peace in which He will be their God and His servant David shall be a prince among them, causing evil beasts to cease and giving safety and showers of blessing and fruitfulness, breaking the yoke and delivering them from those who served themselves of them, with freedom from hunger and shame and fear and from being a prey to the heathen, and with the knowledge that the Lord their God is with them and that they are His people Israel, His flock. The one shepherd is God's servant David, the Messiah appointed over God's flock, fulfilled in Christ. God's people are one flock under one Shepherd, who alone is to guide and guard and direct them.
The shepherd feeds and cares for the scattered flock. He seeks the lost and restores those driven away, binds up the broken and strengthens the sick, and brings His people peace and safety. In this the promise means the Lord will rescue people who have been misled and isolated by unfaithful pastors, by seeking them out and giving them opportunity to hear the truth.
The warning against unfaithful shepherds means God's people should read the chapter carefully, so they are not deceived into acting as such shepherds themselves. Faithful shepherds must return to loyalty to God, and the chapter connects with Isaiah 58, where restoring right paths includes honoring God's law and Sabbath. The most striking feature of the promise is the exceeding richness of pardoning mercy to the sinner if he repents and turns from his sin, salvation through the tender mercies of God that brings no dishonor to justice and leaves no transgression unpunished. Perfect obedience is the condition of life under the new covenant, and pardon is given to the sinner who repents and confesses. Forgiveness is secured by Christ's sacrifice satisfying the demands of the law for every repentant believing sinner, giving to as many as receive Him power to become sons of God through His fullness of grace for grace.