The Hyperlinked Bible
Intertextuality Pair
Allusion
Later text
Incline your ear and come to Me; listen, so that your soul may live. I will make with you an everlasting covenant—My loving devotion promised to David. Behold, I have made him a witness to the nations, a leader and commander of the peoples. Surely you will summon a nation you do not know, and nations who do not know you will run to you. For the LORD your God, the Holy One of Israel, has bestowed glory on you."
Earlier text
Psalm 89:49BSB
Where, O Lord, is Your loving devotion of old, which You faithfully swore to David?
The verbal link sits in verse 3 and is exact. Psalm 89:49 asks, "Where, O Lord, is Your loving devotion (חֶסֶד, chesed) of old, which You faithfully (אֱמוּנָה, emunah) swore to David (דָּוִד)?" Isaiah 55:3 replies with the same three elements: the sure (הַנֶּאֱמָנִים, from אמן, the root of emunah) mercies (חַסְדֵי, from chesed) of David (דָּוִד), now set inside "an everlasting covenant." The psalm asks after a chesed in the past; Isaiah restores it as a covenant without end.
What the fuller range of verses 3-5 adds is the scale of the answer, and it is disproportionate to the question. Psalm 89 wanted the dynasty back. It had spent thirty-seven verses on the promises — throne, seed, sun and moon as witnesses — and then watched them collapse (89:38-45), and verse 49 is its plea that God restore what He swore. Isaiah does not restore it; he expands it past the frame of the question. Verse 3 hands the covenant to a plural "you" rather than to a king. Verse 4 keeps the royal office — "a witness to the nations, a leader and commander of the peoples" — but redirects it outward, to peoples the dynasty had never governed. Verse 5 completes the reversal: "you will summon a nation you do not know, and nations who do not know you will run to you."
So the lament asked for a repaired throne in Jerusalem, and the answer was a covenant open to every thirsty person on earth. Paul preaches exactly that logic from this verse: the "holy and sure blessings of David" are secured by a resurrection (Acts 13:34), and the sermon that quotes it ends with the Gentiles of Antioch rejoicing and glorifying the word of the Lord (Acts 13:47-48, citing Isaiah 49:6).
Psalm 89 ends on a question and a doxology it can barely sustain. Isaiah 55 answers with an invitation and a table: "Come, all you who are thirsty... buy wine and milk without money and without cost... eat what is good, and your soul will delight in the richest of foods" (55:1-2). The everlasting covenant is not merely proved; it is served.