And she said, According unto your words, so be it. And she sent them away, and they departed: and she bound the scarlet line in the window.
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Ambrose of Milan
AD 397
A harlot saw this; and she who in the destruction of the city lost all hope of any means of safety, because her faith had conquered, bound a scarlet thread in her window, and thus uplifted a sign of her faith and the banner of the Lord’s passion; so that the semblance of the mystic blood, which should redeem the world, might be in memory. So, from outside the city, the name of Joshua was a sign of victory to those who fought. From within, the semblance of the Lord’s passion was a sign of salvation to those in danger. - "On the Christian Faith 5.10.127"
So, too, with a mystic reference to the shedding of blood, it was a scarlet cord which the harlot Rahab (a type of the church) hung in her window that she might be saved at the destruction of Jericho. - "Letter 52.3"
