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

Nehemiah 3:19
And next to him repaired Ezer the son of Jeshua, the ruler of Mizpah, another piece over against the going up to the armoury at the turning of the wall.

Canticles 4:4
Thy neck is like the tower of David builded for an armoury, whereon there hang a thousand bucklers, all shields of mighty men.

Jeremiah 50:25
The LORD hath opened his armoury, and hath brought forth the weapons of his indignation: for this is the work of the Lord GOD of hosts in the land of the Chaldeans.