Incline your ear, and come unto me: hear, and your soul shall live; and I will make an everlasting covenant with you, even the sure mercies of David. I will make an everlasting covenant - Hebrews אכרתה לכם ברית עולם echrethah lachem berith olam, "I will cut the old or everlasting covenant sacrifice with you." That covenant sacrifice which was pointed out of old from the very beginning; and which is to last to the consummation of ages; viz., the Lamb of God that was slain from the foundation of the world.
The sure mercies of David - That is, says Kimchi, "The Messiah," called here David; as it is written, "David my servant shall be a prince over you."