John Trapp on Isaiah 51:9

Ver. 9. Awake, awake O Arm of the Lord] God had promiſed what his holy arm ſhould do for his people, ver. 5. Now they beg of him to uſe it, and beſtir himſelf for their relief and reſcue: and this they do magno affictu atque animi impetu, heartily wiſhing the coming of Chriſt and the declaration of the Goſpel, to their Salvation.

Awake as in the ancient daies] God ſeemeth ſometimes to be aſleep, and we muſt wake him; to delay, and we muſt quicken him: to have loſt his compaſſions (which yet never fail:) and we muſt find them for him.

Art not thou it that hath cut Rahab] Or hew[illegible: 1 letter]d Egypt with thy ten plagues ſucceſſively, though ſhe were a proud and potent State?

And wounded the Dragon] Or Crocodile? That is, Pharaoh, Pſal. 74.14. whom thou didſt put to pain, even the pains of a travelling woman (as the word ſignifieth) when he ſank as a mil-ſtone in the mighty waters.