Text: Isaiah 55:3-5
OT Text Referred to: Psalm 89:49
Subject: Covenant promises and faithfulness
Source: Treasury of Scripture Knowledge
Reference Type: Allusion
Connection Method(s): Longitudinal Theme
Anchor Text: Ps 89 — The Davidic Covenant Psalm
Significance: This intertextual connection develops the covenant theme central to redemptive history. What Isaiah 55 establishes, Psalm 89 expands and clarifies, showing the progressive unfolding of God's covenant purposes. All covenants find their 'yes' in Christ (2 Cor 1:20), who is both the mediator of the new covenant and the one in whom all covenant promises are fulfilled.