1.

When Israel went out of Egypt, the house of Jacob from a people of strange language;

2.

Judah was his sanctuary, and Israel his dominion.

Judah was his sanctuary, and Israel his dominion.
Judah — Or Israel, one tribe being put for all. Judah he mentions as the chief of all the tribes.

3.

The sea saw it, and fled: Jordan was driven back.

4.

The mountains skipped like rams, and the little hills like lambs.

The mountains skipped like rams, and the little hills like lambs.
The mountains — Horeb and Sinai, two tops of one mountain, and other neighbouring mountains.

5.

What ailed thee, O thou sea, that thou fleddest? thou Jordan, that thou wast driven back?

6.

Ye mountains, that ye skipped like rams; and ye little hills, like lambs?

7.

Tremble, thou earth, at the presence of the Lord, at the presence of the God of Jacob;

Tremble, thou earth, at the presence of the Lord, at the presence of the God of Jacob;
Tremble — The mountains did more than what was fit at the appearance of the great God.

8.

Which turned the rock into a standing water, the flint into a fountain of waters.