Numbers 10:2-4

CKJV_Strongs(i)
  2 H6213 Make H8147 you two H2689 trumpets H3701 of silver; H4749 of a whole piece H6213 shall you make H1961 them: that you may use H4744 them for the calling H5712 of the assembly, H4550 and for the journeying H4264 of the camps.
  3 H8628 And when they shall blow H2004 with them, H5712 all the assembly H3259 shall assemble H6607 themselves to you at the door H168 of the tabernacle H4150 of the congregation.
  4 H8628 And if they blow H259 but with one H5387 trumpet, then the princes, H7218 which are heads H505 of the thousands H3478 of Israel, H3259 shall gather themselves unto you.