The LORD shall defend Zion
Isa 14:28 In the year that king Ahaz died was this burden.
Isa 14:29 Rejoice not thou, whole Palestina, because the rod of him that smote thee is broken: for out of the serpent's root shall come forth a cockatrice, and his fruit shall be a fiery flying serpent.
God is warning the Philistines to not take pleasure in Israel and Judah's weakness. The Philistines were often at war with them and because God was judging them, they should not take advantage.
Isa 14:30 And the firstborn of the poor shall feed, and the needy shall lie down in safety: and I will kill thy root with famine, and he shall slay thy remnant.
Isa 14:31 Howl, O gate; cry, O city; thou, whole Palestina, art dissolved: for there shall come from the north a smoke, and none shall be alone in his appointed times.
God will also judge the Philistines according to his covenant with Abraham.
Gen 12:3 And I will bless them that bless thee, and curse him that curseth thee: and in thee shall all families of the earth be blessed.
Some see this as a prophecy for modern day Palestine, who are seeking to destroy modern day Israel. The covenant still stands. They may destroy some of the power of Israel, who they call the devil. But, out of the serpent's root shall come forth a cockatrice, and his fruit shall be a fiery flying serpent. This could refer to missiles, aircraft, or weapons of war, which with God's help could destroy all who oppose His covenant people.
Isa 14:32 What shall one then answer the messengers of the nation? That the LORD hath founded Zion, and the poor of his people shall trust in it.
When nations send ambassadors to give ultimatums or to make alliances; remember that it was the LORD who made you his people, the people of Mt. Zion, even the poor of his people, shall trust in Him.
Isa 31:1 Woe to them that go down to Egypt for help; and stay on horses, and trust in chariots, because they are many; and in horsemen, because they are very strong; but they look not unto the Holy One of Israel, neither seek the LORD!
Isa 31:2 Yet he also is wise, and will bring evil, and will not call back his words: but will arise against the house of the evildoers, and against the helpof them that work iniquity.
Isa 31:3 Now the Egyptians are men, and not God; and their horses flesh, and not spirit. When the LORD shall stretch out his hand, both he that helpeth shall fall, and he that is holpen shall fall down, and they all shall fail together.
Isa 31:4 For thus hath the LORD spoken unto me, Like as the lion and the young lion roaring on his prey, when a multitude of shepherds is called forth against him, he will not be afraid of their voice, nor abase himself for the noise of them: so shall the LORD of hosts come down to fight for mount Zion, and for the hill thereof.
Isa 31:5 As birds flying, so will the LORD of hosts defend Jerusalem; defending also he will deliver it; and passing over he will preserve it.