Numbers 29:1

An holy convocation. The seventh month, the first month of the civil year, had been specially set apart for religious purposes (Lev. 23:23-44), and had more days devoted to religious ordinances than any other month of the year. The holy convocation here indicated had already been ordained (Lev. 23:24, 25).

A day of blowing the trumpets. The blowing of the silver trumpets had already been enjoined on various occasions (see ch. 10:10), including the new moons. But the first day of the seventh month, or new year’s day of the civil calendar, was particularly the day for blowing them. The word “trumpets” does not appear either here or in Lev. 23:24. The term teruah, here translated “blowing the trumpets,” appears in Lev. 25:9 shopar, or “ram’s horn.”