Numbers 10:2-4

Young's Literal Translation

² `Make to thee two trumpets of silver; beaten work thou dost make them, and they have been to thee for the convocation of the company, and for the journeying of the camps;

³ and they have blown with them, and all the company have met together unto thee, unto the opening of the tent of meeting.

⁴ And if with one they blow, then have the princes, heads of the thousands of Israel, met together unto thee;