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As with every other element of the Tabernacle worship, musical instrumentation was regulated by specific divine command.  We see the trumpet commanded in Numbers 10 and regulated in the following three ways:  1) The trumpet (including the number of them) was the only musical instrument authorized for use in the Tabernacle worship:  Number 10:1-2, “The Lord spoke further to Moses, saying, ‘Make yourself two trumpets of silver, of hammered work you shall make them. . . . ’”  2) The priests were the only persons authorized to use the trumpets:  Num. 10:8, “The priestly sons of Aaron, moreover, shall blow the trumpets; and this shall be for you a perpetual statute throughout your generations.”  3) The occasions were specified when the trumpets could be used, including worship during the appointed feasts:

Num. 10:10, “Also in the day of your gladness and in your appointed feasts, and on the first days of your months, you shall blow the trumpets over your burnt offerings, and over the sacrifices of your peace offerings, and they shall be as a reminder of you before your God.  I am the Lord you God.”  (See also Lev. 23:24.)

Old Light on New Worship, John Price, page 22