How do we know Rahab's faith is true?

The authenticity of Rahab's faith is evidenced by her actions. She acted on the promise given to her by the spies, tying the scarlet cord in her window, which symbolized her belief in God’s deliverance. In James 2:19, it is stated that faith without works is dead, indicating that real, saving faith manifests in action. Rahab’s willingness to risk her life for the Israelite spies and her obedient display of faith through the scarlet cord demonstrate her true trust in God. This active and obedient faith is what set her apart and ultimately led to her salvation.