John Gill Commentary Isaiah 51:15

"For I am Jehovah thy God, who stirreth up the sea, so that the waves thereof roar: Jehovah of hosts is his name." — Isaiah 51:15 (ASV)

But I am the Lord your God that divided the sea, whose waves
roared
Referring to the dividing of the Red sea by a violent wind, at which time the waves of it doubtless roared till they were made to stand quietly, as a wall on the right and left, for the Israelites to pass through, as in (Isaiah 51:10) . Or this is to be understood of the power of God at any time in stilling and quieting the sea when it rages; which signification the word ^F19 here used has, as Aben Ezra observes; which power is expressed by a rebuke or reproof of it. And so the Targum,

``I am the Lord your God, that rebuketh the sea:'' and in like manner the Syriac version; see (Psalms 106:9) (Isaiah 50:2) with which compare (Matthew 8:26) .

Now he that can do, and oftentimes has done this, can rebuke, restrain, and still the fury of the oppressors, the rage of the persecutors, Rome Pagan or Papal, and deliver out of their hands, (Psalms 65:7) :

the Lord of hosts is his name :
the Lord of armies in heaven and earth, and therefore is able to do these things in a natural, civil, and religious sense.

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FOOTNOTES:

• F19: (egr) "qui tranquillat" Gakater; "faciens quiescere", so some in Vitringa; and the word has the signification of rest and quietness in ver 4.