The most famous wind instruments of the Bible are the trumpet and the horn. The Hebrew Scriptures mention the hatsotsrot (trumpets made of silver) and the shofarot (horns made of rams' or antelopes' horns). God commanded Moses (in the Torah) to make two silver trumpets or hatsotsrot "for the calling of the assembly, and for the journeying of the camps" (Leviticus 10:2). They were blown singly or together, and with different kinds of calls: teqi'a (a simple blowing) and teru'ah (a sounding of an alarm). It was the sound of the Shofar that assembles the sons of Israel at Mt. Sinai and it was the sound of the Shofar, too, that brought down the walls of Jericho. When the Hebrew Scriptures explicitly describe what type of horns the shofarot are made from (as in Joshua 6:4), they always mention ram's horns. The only percussion instruments allowed to accompany psalm-singing were the cymbals (cf. 1 Chronicles 25:1), which were always used in pairs. In the accounts relating to the transport of the Ark of the Covenant, the cymbals are called either metsiltayim (1 Chronicles 15:9) or tsiltsilim (1 Samuel 6:5). The former are explicitly said to have been made of bronze.