The city shall be devoted, even it and all that is therein, to Yahweh: only Rahab the prostitute shall live, she and all who are with her in the house, because she hid the messengers that we sent.
The writer did not explain the reasons for Israel circling Jericho once a day for six days and then seven times the seventh day. This strategy did give the king of Jericho an opportunity to surrender. The uniqueness of this approach undoubtedly impressed everyone with the supernatural character of the victory. It involved almost incredible faith for the Israelites (Hebrews 11:30). There was probably also some significance to the number seven. This may have impressed the Israelites further that the victory was a complete work of God, following the pattern of the seven days of creation.