Our God in heaven above and on the earth below.

Joshua 2:8-24
Our God in heaven above and on the earth below.
Rahab tied the scarlet cord in the window as a sure sign that it will spare the lives of those who enter this house.
These two spies reported to Joshua that "The Lord has surely given the whole land into our hands; all the people are melting in fear because of us."
Rahab's house was built on or into the city wall , with a flat roof on which produce could be spread out to dry - in this case flax, from which she would spin linen thread. The house of a prostitute was somewhere two men might go with no questions asked' and no doubt a good place to pick up information. The Israelite kept their promise to her.
Why?
The sign of red scarlet on the window is a sign of salvation, so as the Jesus on the Cross is sign of our life from dead to eternal life.
Our Lord in heaven above all on the earth and below.
The storyteller makes no attempt to 'clean up' Rahab's reputation. The tale is simply told. As Rahab saves the lives of the spies, so she and her family come under God's protection to find a permanent home among God's people and become part of the great salvation story.
Rahab was naturalized, married Salmon, and through he son Boaz became an ancestress not only David but of Jesus himself.
How?
Salvation sign is the cross of Jesus Christ, believe in him will be saved and free from sin.