In Joshua 2:3-5, Rahab lied about the presence of the spies. God's Law forbids lying about someone. It doesn't necessarily forbid lying itself, especially when it is to save a life or confound God's enemies.
Rahab hid the spies under a pile of flax. Flax is used to make linen, which is used throughout Scripture as a metaphor of righteousness. This detail might have been included as a subtle nod to her righteous faith expressed in giving these men shelter. She acted in faith to save the two spies before making any requests of them. By the time she asked for their help, there was no turning back. Her life was already forfeit for defying the king of Jericho.
Rahab sacrificed her life, covered the Israelites in righteousness, sent them into the wilderness for three days, and then her life was metaphorically restored to her when Jericho fell. Hmm...
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