Bamidbar 10:9-11

Orthodox Jewish Bible

⁹ And if ye go into milchamah (battle) in your land against the enemy that oppresseth you, then ye shall sound a blast on the tzotzerot; and ye shall be remembered before Hashem Eloheichem, and ye shall be saved from your enemies.

¹⁰ Also in the day of your simcha, and in your moadim, and in the Rosh-Chodesh, ye shall sound a blast on the tzotzerot over your olot, and over the zevakhim of your shelamim; that they may be to you for a memorial reminder before Eloheichem: I am Hashem Eloheichem.

¹¹ And it came to pass on the twentieth day of the second month, in the second year, that the Anan was lifted up from off the Mishkan HaEdut.