Behold, when we come into the land, thou shalt bind this line of scarlet thread in the window which thou didst let us down by: and thou shalt bring thy father, and thy mother, and thy brethren, and all thy father's household, home unto thee. This line of scarlet thread - תקות חוט השני tikvath chut hashshani. Probably this may mean, this piece of scarlet cloth, or, this cloth (made) of scarlet thread. When the Israelites took the city this piece of red cloth seems to have been hung out of the window by way of flag; and this was the sign on which she and the spies had agreed.
Related Commentaries of Joshua 2:18
Joshua 2:18
18 Behold, when we come into the land, thou shalt bind this line of scarlet thread in the window which thou didst let us down by: and thou shalt bringc thy father, and thy mother, and thy brethren, and all thy father's household, home unto thee.