What does the Bible say about the scarlet cord in Joshua 2?

In Joshua 2, the scarlet cord represents a powerful spiritual truth about salvation through Christ. Just as Rahab displayed the cord, signifying her family's safety, it serves as a picture of the blood of Christ, which was shed for the salvation of the elect. The blood is not merely a possibility for salvation but is effectual, accomplishing what it was intended to do for those who believe. As the cord assured Rahab's safety, so does the blood of Christ ensure the surety of salvation for all who are under it.