This line of scarlet thread - Joshua 2:8
It speaks of the precious blood of Christ. Scarlet is the color of Calvary. Twine it round the window through which thou lookest out on thy foes, and away to the river of death. Nothing can hurt the soul which has put the precious blood of Christ between it and condemnation or alarm. Let every outlook to the future be associated with a remembrance that His blood was shed for thee, and be thou thankful.
Let us see to it that, like Rahab, we gather father and mother, brethren and friends, to share with us the shelter and safeguard of the precious blood.
But, after all, it was not the cord that saved - that was only the emblem and type. Behind it on the one hand was God's oath, spoken through the spies, and on the other was Rahab's faith. The true safety of that house on the wall stood in the moral attitude of one woman in it. Rahab believed God who had dried up the water of the Red Sea, and who was God in heaven above and in earth beneath. This faith raised her afterward from her life of shame to become the ancestress of Christ. Such wonders does the blood of Christ work in outcasts from the commonwealth of Israel, bringing them nigh.