It's no coincidence that our sins are described as "scarlet."
“Come now, let us reason together,” says the LORD. “Though your sins are like scarlet, they shall be as white as snow." Isaiah 1:18
Rahab's cord was symbolic of her commitment to repent of her sins and turn from her pagan lifestyle to become one of God's children. She made a clear profession of her faith when she hid the spies (Joshua 2).
The blood of Christ was also scarlet, not because of His sin (for He had none) but because of your sins and mine. And when it flowed, it represented a scarlet cord than anyone could claim - a symbol of our repentance from sin and acceptance of Christ (1 Corinthians 11:23-29).
Whenever you see the color scarlet remember it's significance in the Gospel message.
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