Joshua 2:21

“And she said, according to your words, so [be] it, etc.] She agreed, that if the conditions required were not performed, they would be quit of their oath, but if they were, she expected it would be fulfilled: and she sent them away, and they departed; took their leave of each other: and she bound the scarlet line in the window; immediately, as Abarbinel thinks, and in the sight of the spies, that they might see that she conformed to their direction, and that they might take notice where she fastened it; and that she herself might, at the sight of it, be put in mind of the design of it, and be an encouragement to her faith as to the safety of her and her father’s house; and it being a thing…”

“she bound the scarlet line in the window--probably soon after the departure of the spies. It was not formed, as some suppose, into network, as a lattice, but simply to hang down the wall. Its red color made it conspicuous, and it was thus a sign and pledge of safety to Rahab's house, as the bloody mark on the lintels of the houses of the Israelites in Egypt to that people. Next: Joshua Chapter 3”

“In the window - Forthwith, partly that the spies might see it hung out before their departure, and so the better know it at some distance; partly lest some accident might occasion a neglect about it. Joshua 2:22”

“And she bound: Jos 2:18; Mat 7:24; Joh 2:5 Joshua 2:22”

“When Rahab had accepted all these conditions, she let the men go, and bound the red cord in the window. It is not to be supposed that she did this at once, but merely as soon as it was necessary. It is mentioned here for the purpose of bringing the subject to a close. Joshua 2:22”