Isaiah 51:9-11

9 Wake up! Wake up!
Clothe yourself with strength, O arm of the Lord!
The arm of the Lord is a symbol of divine military power. Here it is personified and told to arouse itself from sleep and prepare for action.

Wake up as in former times, as in antiquity!
Did you not smash
Heb “Are you not the one who smashed?” The feminine singular forms agree grammatically with the feminine noun “arm.” The Hebrew text has ַהמַּחְצֶבֶת (hammakhtsevet), from the verbal root חָצַב (khatsav, “hew, chop”). The Qumran scroll 1QIsaa has, probably correctly, המחצת, from the verbal root מָחַץ (makhats, “smash”) which is used in Job 26:12 to describe God’s victory over “the Proud One.”
the Proud One?
This title (רַהַב, rahav, “proud one”) is sometimes translated as a proper name: “Rahab” (cf. NAB, NASB, NIV, NRSV). It is used here of a symbolic sea monster, known elsewhere in the Bible and in Ugaritic myth as Leviathan. This sea creature symbolizes the forces of chaos that seek to destroy the created order. In the Bible “the Proud One” opposes God’s creative work, but is defeated (see Job 26:12; Ps 89:10). Here the title refers to Pharaoh’s Egyptian army that opposed Israel at the Red Sea (see v. 10, and note also Isa 30:7 and Ps 87:4, where the title is used of Egypt).

Did you not
The words “did you not” are understood by ellipsis (note the preceding line). The rhetorical questions here and in v. 10 expect the answer, “Yes, you certainly did!”
wound the sea monster?
Hebrew תַּנִּין (tannin) is another name for the symbolic sea monster. See the note at 27:1. In this context the sea creature represents Egypt. See the note on the title “Proud One” earlier in this verse.

10 Did you not dry up the sea,
the waters of the great deep?
Did you not make
The Hebrew text reads literally, “Are you not the one who dried up the sea, the waters of the great deep, who made…?”
a path through the depths of the sea,
so those delivered from bondage
Heb “the redeemed” (so ASV, NASB, NIV, NRSV); KJV “the ransomed.”
could cross over?
11 Those whom the Lord has ransomed will return;
they will enter Zion with a happy shout.
Unending joy will crown them,
Heb “[will be] on their head[s].” “Joy” may be likened here to a crown (cf. 2 Sam 1:10). The statement may also be an ironic twist on the idiom “earth/dust on the head” (cf. 2 Sam 1:2; 13:19; 15:32; Job 2:12), referring to a mourning practice.

happiness and joy will overwhelm
Heb “overtake” (so NIV); NASB “they will obtain.”
them;
grief and suffering will disappear.
Heb “grief and groaning will flee.”

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