The Feast of the New Moon: Celebrated with Blowing of Trumpets
Source: TTT
Numbers 10:10
And on your joyous occasions, your appointed feasts, and the beginning of each month, you are to blow the trumpets over your burnt offerings and fellowship offerings to serve as a reminder for you before your God. I am the LORD your God.”
Psalm 81:3, 4
Sound the ram’s horn at the New Moon, and at the full moon on the day of our Feast. / For this is a statute for Israel, an ordinance of the God of Jacob.