Awake, awake, put on strength, O arm of the LORD; awake, as in days of old, the generations of long ago. Was it not you who cut Rahab in pieces, who pierced the dragon?
In these verses we have, I. A prayer that God would, in his providence, appear and act for the deliverance of his people and the mortification of his and their enemies. Awake, awake! put on strength, O arm of the Lord! Isa 51:9. The arm of the Lord is Christ, or it is put for God himself, as Psa 44:23. Awake! why sleepest thou?
Commenting on Isaiah 51:9-16
Awake, awake, put on strength, O arm of the Lord,.... The Septuagint and Arabic versions take the words to be an address to Jerusalem; and the Syriac version to Zion, as in Isa 51:17, but wrongly: they are, as Jarchi says, a prayer of the prophet, or it may be rather of the church represented by him; and are addressed either to God the Father...
Impassioned prayer of the exiled Jews. ancient days-- (Psa 44:1). Rahab--poetical name for Egypt (see on Isa 30:7). dragon--Hebrew, tannin. The crocodile, an emblem of Egypt, as represented on coins struck after the conquest of Egypt by Augustus; or rather here, "its king," Pharaoh (see on Isa 27:1; Psa 74:13-14; Eze 32:2, Margin; Eze 29:3).