Verses with the word fallow in the Old Testament (3 verses):

Deuteronomy 14:5
The hart, and the roebuck, and the fallow deer, and the wild goat, and the pygarg, and the wild ox, and the chamois.

Jeremiah 4:3
For thus saith the LORD to the men of Judah and Jerusalem, Break up your fallow ground, and sow not among thorns.

Hosea 10:12
Sow to yourselves in righteousness, reap in mercy; break up your fallow ground: for it is time to seek the LORD, till he come and rain righteousness upon you.