Charles Spurgeon Commentary Isaiah 27:1

"In that day Jehovah with his hard and great and strong sword will punish leviathan the swift serpent, and leviathan the crooked serpent; and he will slay the monster that is in the sea." — Isaiah 27:1 (ASV)

In that day the LORD with his sore and great and strong sword shall punish leviathan the piercing serpent, That is to say, He will punish those who are like leviathan; the proudest, the greatest, and the most powerful sinners will not escape divine justice.

God's laws are not, like cobwebs, meant to catch the little flies while the great ones break through, but He will strike leviathan, He will surely punish the mightiest sinners of the earth.

Even leviathan that crooked serpent;

Difficult to approach, difficult to find, he shall not escape the sword of the Lord.

And he shall slay the dragon that is in the sea.

If men should try to hide from God in hell itself, yet he would find them out; there is no possibility that any offender shall escape his all-seeing eye.