Verses with the word thickets in the Old Testament (4 verses):

1 Samuel 13:6
When the men of Israel saw that they were in a strait, (for the people were distressed,) then the people did hide themselves in caves, and in thickets, and in rocks, and in high places, and in pits.

Isaiah 9:18
For wickedness burneth as the fire: it shall devour the briers and thorns, and shall kindle in the thickets of the forest, and they shall mount up like the lifting up of smoke.

Isaiah 10:34
And he shall cut down the thickets of the forest with iron, and Lebanon shall fall by a mighty one.

Jeremiah 4:29
The whole city shall flee for the noise of the horsemen and bowmen; they shall go into thickets, and climb up upon the rocks: every city shall be forsaken, and not a man dwell therein.