Numbers 10:9-11

Darby Translation

⁹ And if ye go to war in your land against the enemy that oppresseth you, then ye shall blow an alarm with the trumpets; and ye shall be remembered before Jehovah your God, and ye shall be saved from your enemies.

¹⁰ And in the day of your gladness, and in your set feasts, and in your new moons, ye shall blow with the trumpets over your burnt-offerings and over your sacrifices of peace-offering; and they shall be to you for a memorial before your God: I am Jehovah your God.

¹¹ And it came to pass in the second year, in the second month, on the twentieth of the month, that the cloud was taken up from off the tabernacle of the testimony.