Around 1400 b.c., two scouts cross the Jordan River and climb into a fortified city. They hide under bundles of flax stalks drying on a flat timber roof. The air is heavy with valley heat and the sharp smell of retting plant fiber, a standard stage in ancient textile manufacturing where plant stems are soaked and sun-dried. Each bundle weighs roughly twenty pounds. The scouts lie flat beneath the rough plant matter, soaking in sweat and physical exhaustion from the long desert march. The woman of the house offers them concealment and a route to safety, granting them relief from the city guard.
The scouts enter the residence of Rahab, a harlot living inside the concentric mudbrick walls of Jericho. The king of the city sends armed men to capture the intruders. Rahab directs the officers toward the river fords instead. She hides the scouts because she knows the Lord of Heaven and Earth has given them the land, and she trusts his power over the local rulers. She strikes a bargain for the lives of her father, mother, and brothers. She then lowers the men through her window using a heavy woven rope.
The crimson cord serves as a simple mechanical signal for military identification. It is braided from dyed flax thread and woven strong enough to bear the weight of two grown men sliding down the outer stone masonry. This colored line turns an ordinary window into a secure border crossing. People will always barter whatever materials they possess to secure survival when a fortress begins to fail.
A strong rope in the right window is worth more than a stone wall when the city is surrounded.
The scarlet cord marked a single house for preservation while the surrounding fortifications collapsed into rubble. The surviving family integrated into the nation of Israel and left a permanent mark on its genealogical records.