Bible Dictionary · B
Bell
The bells first mentioned in Scripture are the small golden bells attached to the hem of the high priest’s ephod (Ex 28:33, Ex 28:34, Ex 28:35). The “bells of the horses” mentioned by Zechariah (Zech 14:20) were attached to the bridles or belts round the necks of horses trained for war, so as to accustom them to noise and tumult.
From Easton’s Bible Dictionary (1897), by Matthew George Easton.