Leviticus 23:24

, Speak unto the children of Israel, saying, In the seventh month, in the first day of the month, shall ye have a Sabbath, a memorial of blowing of trumpets, an holy convocation. It was a feast Sabbath, distinguished from the ordinary new moons, and a Sabbath of memorial. The feature of the day was the sounding of the trumpets, horns, or trombones, which belonged to the equipment of the Sanctuary, Numbers 10:2.