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. Bibliography Information Easton, Matthew George. M.A., D.D., "Biblical Meaning for 'Bell' Eastons Bible Dictionary". bible-history.com - Eastons; 1897.