The Lord commanded Moses to make two trumpets of beaten silver, for the purpose of calling the people together when they were to decamp, Numbers 10:2 . They used these trumpets to proclaim the beginning of the civil year, of the sabbatical year, Leviticus 23:24 Numbers 29:1 , and of the jubilee, Leviticus 25:9-10 . See MUSIC .
The feast of Trumpets was kept on the first day of the seventh month of the sacred year, which was the first of the civil year, called Tishri. The beginning of the year was proclaimed by sound of trumpet, Leviticus 23:24 Numbers 29:1; and the day was kept solemn, all servile business being forbidden. In addition to the daily and the monthly sacrifices, Numbers 28:11-15 , a solemn holocaust was offered in the name of the whole nation, of a bullock, a ram, a kid, and seven lambs of the same year, with offerings of flour and wine, as usual with these sacrifices. Scripture does not mention the occasion of appointing this feast.