In Joshua 6, only the priests and men of war marched around Jericho. The rest of the people waited until the final trumpet on the seventh day to add their voices and join in the attack.

Seven priests bearing seven trumpets before the Ark of the Covenant marching around Jericho prophesied of the seven angels who sound their trumpets before the throne of God in Revelation. The seventh trumpet blast on the seventh day was a prophecy of the final trumpet that Paul wrote of in 1 Corinthians 15:52. The collapsing walls of Jericho prophesied of the fall of death and the great resurrection.
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