Bamidbar 10:9

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.

Bamidbar 10:9 In-Context

7 But when the Kahal is to be gathered together, ye shall sound it, but ye shall not sound a teruah.
8 And the Bnei Aharon, the kohanim, shall sound the tzotzerot; and they shall be to you for a chukkat olam throughout your dorot.
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.
The Orthodox Jewish Bible fourth edition, OJB. Copyright 2002,2003,2008,2010, 2011 by Artists for Israel International. All rights reserved.