two trumpets: The necessity of such instruments will at once appear, when the amazing extent of this army is considered. There were various kinds of trumpets among the ancients, of different forms and materials, as Eustathius shews on Homer, where he mentions six; the second of which was στρογγυλη:, turned up round, like a ram's horn; which he says the Egyptians used (from being invented by Osiris) when they assembled the people to their sacrifices. But in opposition to that form, Moses commands these to be made long, in the shape of those used at present. So Josephus informs us, who says they were near a cubit long; the tube of the thickness of a common pipe or flute; the mouth no wider than just to admit blowing into them; and their ends wide like those of a modern trumpet. 2 Kings 12:13; 2 Chronicles 5:12
of a whole piece: Exodus 25:18, Exodus 25:31; Ephesians 4:5
the calling: Numbers 10:7; Psalms 81:3, Psalms 89:15; Isaiah 1:13; Hosea 8:1; Joel 1:14