The bells first mentioned in Scripture are the small golden bells attached to the hem of the high priest’s ephod (Ex. 28:33, 34, 35). The “bells of the horses” mentioned by Zechariah (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.
Source:Easton's Bible Dictionary (1897)Public domain