1.

God is our refuge and strength, a very present help in trouble.

2.

Therefore will not we fear, though the earth be removed, and though the mountains be carried into the midst of the sea;

Therefore will not we fear, though the earth be removed, and though the mountains be carried into the midst of the sea;
Though — Though there should be nothing but confusion, and desolations round about us: which are often expressed by such metaphors.

3.

Though the waters thereof roar and be troubled, though the mountains shake with the swelling thereof. Selah.

4.

There is a river, the streams whereof shall make glad the city of God, the holy place of the tabernacles of the most High.

There is a river, the streams whereof shall make glad the city of God, the holy place of the tabernacles of the most High.
A river — This may design the gracious presence, and blessing of the Lord, which is frequently described under the name of waters.
Make glad — Shall not barely preserve it from danger, but give great occasion for rejoicing and thanksgiving.
The city — Jerusalem, the place where God's holy tabernacle is settled.

5.

God is in the midst of her; she shall not be moved: God shall help her, and that right early.

6.

The heathen raged, the kingdoms were moved: he uttered his voice, the earth melted.

7.

The LORD of hosts is with us; the God of Jacob is our refuge. Selah.

The LORD of hosts is with us; the God of Jacob is our refuge. /*Selah*/.
Raged — Against God, and against his people.
Uttered — He spake to them in his wrath.
The earth — The inhabitants of the earth were consumed.

8.

Come, behold the works of the LORD, what desolations he hath made in the earth.

Come, behold the works of the LORD, what desolations he hath made in the earth.
Desolations — Among those who were vexatious to God's people.

9.

He maketh wars to cease unto the end of the earth; he breaketh the bow, and cutteth the spear in sunder; he burneth the chariot in the fire.

He maketh wars to cease unto the end of the earth; he breaketh the bow, and cutteth the spear in sunder; he burneth the chariot in the fire.
To cease — He hath settled as in a firm and well-grounded peace.
The land — Of Israel: from one end of it to the other.
The bow — The bows and spears, and chariots of their enemies.

10.

Be still, and know that I am God: I will be exalted among the heathen, I will be exalted in the earth.

11.

The LORD of hosts is with us; the God of Jacob is our refuge. Selah.

The LORD of hosts is with us; the God of Jacob is our refuge. /*Selah*/.
Be still — Stir no more against my people.
God — The only true and almighty God; your gods are but dumb and impotent idols.
Exalted — I will make myself glorious by my great and wonderful works.