Nehemiah 4:17-18, 21

Those who built on the wall, and those who carried burdens, loaded themselves so that with one hand they worked at construction, and with the other held a weapon. Every one of the builders had his sword girded at his side as he built. And the one who sounded the trumpet was beside me.

So we labored in the work, and half of the men held the spears from daybreak until the stars appeared.