A true token - literally, "a sign" or "pledge of truth; "something to bind them to keep their promise faithfully. The "token" was the oath which the spies take Joshua 2:14.

Swear unto me by the Lord - This is a farther proof that this woman had received considerable instruction in the Jewish faith; she acknowledged the true God by his essential character Jehovah; and knew that an oath in his name was the deepest and most solemn obligation under which a Jew could possibly come. Does not this also refer to the command of God, Thou shalt fear the Lord, and shalt swear by his name? See the note on Deuteronomy 6:13.

Now therefore, I pray you, swear unto me by the Lord,.... Which being a religious action, and done by men that feared the Lord, she knew it would be binding upon them: the Targum is,"swear to me by the Word of the Lord:"

since I have showed you kindness; by receiving them with peace into her house, and hiding them when inquired for and demanded of her; in doing which she risked her own, life, had this treachery to her country, as it would have been deemed, been discovered;

that you will also show kindness unto my father's house; she mentions not herself and household, for if this was granted that would be implied and included; and this she presses for by the law of retaliation and friendship, for since she had shown kindness to them, it was but reasonable it should be returned:

and give me a true token; that she and her father's house would be saved by them when the city should be taken and the inhabitants destroyed; a token that would not deceive her, on which she might depend, and would be firm and sure.

After this confession Rahab entreated the spies to spare her family (father's house), and made them promise her on oath as a sign of their fidelity, that on the capture of Jericho, which is tacitly assumed as self-evident after what had gone before, they would save alive her parents, and brothers and sisters, and all that belonged to them (i.e., according to Joshua 6:23, the children and families of her brothers and sisters), and not put them to death; all of which they promised her on oath. "A true token," lit. a sign of truth, i.e., a sign by which they guaranteed the truth of the kindness for which she asked. This sign consisted in nothing but the solemn oath with which they were to confirm their assurance, and, according to Joshua 2:14, actually did confirm it. The oath itself was taken in these words, "our soul shall die for you," by which they pledged their life for the life of Rahab and her family in this sense: God shall punish us with death if we are faithless, and do not spare thy life and the lives of thy relations. Though the name of God is not really expressed, it was implied in the fact that the words are described as swearing by Jehovah. But the spies couple their assurance with this condition, "if ye utter not this our business," do not betray us, sc., so that we should be pursued, and our life endangered; "then will we show thee mercy and truth" (cf. Genesis 24:27).

Now therefore, I pray you, swear unto me by the LORD, since I have showed you kindness, that ye will also show kindness unto my father's house, and give me a true token:

2:12 By the Lord - By your God who is the only true God: so she owns his worship, one eminent act whereof is swearing by his name. My father's house - My near kindred, which she particularly names, Jos 2:13, husband and children it seems she had none. And for herself, it was needless to speak, it being a plain and undeniable duty to save their preserver. True token - Either an assurance that you will preserve me and mine from the common ruin: or a token which I may produce as a witness of this agreement, and a means of my security. This is all that she asks. But God did for her more than she could ask or think. She was afterwards advanced to be a princess in Israel, the wife of Salmon and one of the ancestors of Christ.

2:8-21 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.