Numbers 10:2 ASV

¹  And Jehovah spake unto Moses, saying,

²  Make thee two trumpets of silver; of beaten work shalt thou make them: and thou shalt use them for the calling of the congregation, and for the journeying of the camps.

³  And when they shall blow them, all the congregation shall gather themselves unto thee at the door of the tent of meeting.

⁴  And if they blow but one, then the princes, the heads of the thousands of Israel, shall gather themselves unto thee.