John Gill Commentary Joshua 2:12

"Now therefore, I pray you, swear unto me by Jehovah, since I have dealt kindly with you, that ye also will deal kindly with my father`s house, and give me a true token;" — Joshua 2:12 (ASV)

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.