Boyd’s Bible Dictionary:

Concise Bible Dictionary:

2. metsilloth, “bells” from their tinkling (Zech. 14:2020In that day shall there be upon the bells of the horses, HOLINESS UNTO THE LORD; and the pots in the Lord's house shall be like the bowls before the altar. (Zechariah 14:20)), but in the margin is read “or bridles.” These are supposed to be the metallic plates suspended from the heads of the horses, on which inscriptions can be engraved, and which make a tinkling noise. At the restoration and blessing of IsraelHoliness unto the Lord” will be engraved on such plates.

From Manners and Customs of the Bible:

It was quite common among ancient nations to have bells hung around the necks of horses, both by way of ornament and to accustom the war-horses to noise. At the present time bells are used in caravans for horses and camels; sometimes being strung around the legs, as well as suspended from the neck. They are designed, not only for ornament, but also to encourage the animals by their sound, to frighten beasts of prey, and to keep the caravan together.
Some suppose that metsilloth, “bells,” were small pieces of metal resembling cymbals, which made a tinkling noise by collision as the horses moved.

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