Joshua 2:8-15
Before the spies lay down for the night, she went up on the roof and said to them, "I know that the LORD has given this land to you and that a great fear of you has fallen on us, so that all who live in this country are melting in fear because of you. We have heard how the LORD dried up the water of the Red Sea for you when you came out of Egypt, and what you did to Sihon and Og, the two kings of the Amorites east of the Jordan, whom you completely destroyed. When we heard of it, our hearts melted in fear and everyone's courage failed because of you, for the LORD your God is God in heaven above and on the earth below.
 
"Now then, please swear to me by the LORD that you will show kindness to my family, because I have shown kindness to you. Give me a sure sign 13 that you will spare the lives of my father and mother, my brothers and sisters, and all who belong to them—and that you will save us from death." "Our lives for your lives!" the men assured her. "If you don't tell what we are doing, we will treat you kindly and faithfully when the LORD gives us the land." So she let them down by a rope through the window, for the house she lived in was part of the city wall.