Joshua 2:18

King James Version (KJV)

Behold, when we come into the land, thou shalt bind this line of scarlet thread in the window which thou didst let us down by: and thou shalt bring thy father, and thy mother, and thy brethren, and all thy father’s household, home unto thee.

Adam Clarke
Bible Commentary

This line of scarlet thread - השני חוט תקות tikvath chut hashshani . Probably this may mean, this piece of scarlet cloth, or, this cloth (made) of scarlet thread. When the Israelites took the city this piece of red cloth seems to have been hung out of the window by way of flag; and this was the sign on which she and the spies had agreed.

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Albert Barnes
Notes on the Whole Bible

The “line” or cord was spun of threads dyed with cochineal: i. e., of a deep and bright scarlet color. The color would catch the eye at once, and supplied an obvious token by which the house of Rahab might be distinguished. The use of scarlet in the Levitical rites, especially in those more closely connected with the idea of putting away of sin and its consequences (compare e. g., Leviticus 14:4, Leviticus 14:6, Leviticus 14:51; Numbers 19:6), naturally led the fathers, from Clement of Rome onward, to see in this scarlet thread, no less than in the blood of the Passover (Exodus 12:7, Exodus 12:13, etc.), an emblem of salvation by the Blood of Christ; a salvation common alike to Christ‘s messengers and to those whom they visit.

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Matthew Henry
Concise Bible Commentary

Rahab had heard of the miracles the Lord wrought for Israel. She believed that his promises would certainly be fulfilled, and his threatenings take effect; and that there was no way of escape but by submitting to him, and joining with his people. The conduct of Rahab proved that she had the real principle of Divine faith. Observe the promises the spies made to her. The goodness of God is often expressed by his kindness and truth, Ps 117:2; in both these we must be followers of him. Those who will be conscientious in keeping promises, are cautious in making them. The spies make needful conditions. The scarlet cord, like the blood upon the doorpost at the passover, recalls to remembrance the sinner's security under the atoning blood of Christ; and that we are to flee thereto for refuge from the wrath of a justly offended God. The same cord Rahab used for the saving of these Israelites, was to be used for her own safety. What we serve and honour God with, we may expect he will bless, and make useful to us.

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