Context: Both oracles belong to Isaiah's consolation of exiled Israel (chs. 40-55), where the return from Babylon is announced as a second exodus. In 43:14-17 the LORD identifies Himself as "your Redeemer, the Holy One of Israel" who "for your sake" will send to Babylon and bring down the Chaldeans — and then grounds that future deliverance in His credentials as the warrior of the first exodus: "Thus says the LORD, who makes a way in the sea and a path through the surging waters, who brings out the chariots and horses, the armies and warriors together, to lie down, never to rise again; to be extinguished, snuffed out like a wick" (43:16-17). The participles are deliberately present-tense: the sea-splitting, army-drowning God is who Yahweh is, not merely what He once did. Isaiah 51:9-10 turns the same theology into liturgical petition: "Awake, awake, put on strength, O arm of the LORD... Was it not You who cut Rahab to pieces, who pierced through the dragon? Was it not You who dried up the sea, the waters of the great deep, who made a road in the depths of the sea for the redeemed to cross over?" Here three horizons are fused into one act of divine warfare — creation's subjugation of the chaos-monster (Rahab, the dragon), the drying of the Red Sea, and the anticipated highway home from exile (51:11). The original meaning is that the God who conquered chaos and Egypt is both able and pledged to repeat His victory for the exiles.
Hebrew Key Terms:
OT-to-OT Development: This is intra-OT typological reuse of the most explicit kind (Beale; Chou): Isaiah takes Exodus 14-15 — the way through the sea (Exod 14:21-22), the drowned chariots and army (14:28; 15:4-5) — and redeploys it as the pattern for a future deliverance from Babylon (Isaiah 43:14-17 to Exodus 14). Isaiah 51:9-10 reaches further back still, fusing the creation-combat poetics of Psalm 74:13-14 ("You broke the heads of the dragons of the sea") and Job 26:12 with the Red Sea, so that creation, exodus, and return from exile become three installments of one continuous divine warfare against chaos (Isaiah 51:9 to Isaiah 27:1 — where the same dragon-slaying is projected onto the eschatological Day). Isaiah 11:15-16 had already promised the sea dried up for a second-exodus highway; Isaiah 63:11-13 recites the same arm-of-the-LORD tradition retrospectively (Isaiah 63:13 to Isaiah 51:10). Isaiah thus hands the completed new-exodus warfare pattern to the NT.
Connections:
Christological Connection: In their own setting these oracles teach that redemption is divine warfare: the Redeemer (gōʾēl) frees His people by defeating their captor, and His past victories — over chaos at creation, over Egypt at the sea — are the guarantee of the victory still to come. Isaiah's fusion of horizons establishes a canonical principle: the exodus is not a closed historical episode but a pattern of Yahweh's saving warfare that He Himself promises to re-enact on a greater scale ("Behold, I am about to do something new," 43:19).
The NT announces that the promised new exodus has arrived in Jesus. Mark opens his Gospel with Isaiah 40:3's new-exodus herald (Mark 1:2-3); at the transfiguration Jesus speaks of the exodos He is about to accomplish at Jerusalem (Luke 9:31); and the redemption price is "not with perishable things... but with the precious blood of Christ" (1 Pet 1:18-19), the true gōʾēl payment. The arm of the LORD that Isaiah 51:9 summons to awake is, in Isaiah's own unfolding argument, finally revealed in the suffering Servant — "to whom has the arm of the LORD been revealed?" (Isa 53:1) — and John applies precisely that verse to Jesus (John 12:38). The escalation runs along Isaiah's own lines: from Egypt to Babylon to the dragon himself — at the cross the ancient serpent behind both Pharaoh and Babylon is decisively defeated (Col 2:15; Rev 12:9-11), and the redeemed cross over not a sea but from death to life. Note the trajectory's anti-default ruling: Christ is not a type of the arm of the LORD; He is the arm of the LORD revealed — divine-identity inclusion, not type-antitype escalation between two agents.
Already/not-yet: the new exodus is inaugurated — the Redeemer has come, the ransomed are already returning to Zion with everlasting joy begun (51:11; Heb 12:22) — but Isaiah 27:1's final dragon-slaying awaits the consummation, when the Rider on the white horse destroys the beast and the devil is thrown down forever (Rev 19:20-20:10).
Connection Method(s): Typology (Providential, Forward-Looking) — the Red Sea deliverance functions as a divinely intended pattern for greater deliverance to come, and the OT indicator is supplied by Isaiah himself, who typologizes the exodus within the OT (43:16-19; 51:9-11). All five criteria are met: analogical correspondence (deliverance from a captor through Yahweh's warfare, a way made for the redeemed to cross); historicity (exodus and the redemption accomplished in Christ are both historical); escalation (from Egypt and Babylon to sin, death, and the dragon); pointing-forwardness (Isaiah's "something new" explicitly projects the pattern forward); retrospective interpretation (Mark 1:2-3; Luke 9:31; John 12:38 identify the fulfillment). Crucially, the type is the event (exodus deliverance), not the Warrior — Christ does not escalate Yahweh; He is Yahweh come in person. Also Longitudinal Theme — these texts are the canonical home of the chaos-combat motif (Rahab, the dragon, the sea), binding creation, exodus, and new exodus into the single canon-wide Divine Warrior theme that runs to Revelation. Also Promise-Fulfillment — 43:14-21 is verbal promise ("I will send to Babylon... I am about to do something new") whose near fulfillment in the return from exile is itself the down payment on the final redemption accomplished in Christ.
Trajectory Table: 047 - Divine Warrior (God Who Fights)