Rahab reveals her faith!
Joshua 2:8-11 Before the spies lay down for the night, she went up on the roof (9) 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. (10) 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. (11) When we heard of it, our hearts melted and everyone's courage failed because of you, for the LORD your God is God in heaven above and on the earth below.
The first thing Rahab said was 'I know that the Lord has given you the land and terror has fallen upon us.' We don't know the history of her statement but the light of God has been shining upon this woman. She has come to realize things about the nation of Israel and their God. Verse 10 tells us what it was that had spoken to her. It was the miraculous things that the God of Israel had done! - How He dried up the Red Sea for Israel to cross over on dry ground, and how they had destroyed the two kings of the Amorites on the other side of Jordan. And in verse 11 Rahab expresses the outcome of this knowledge. Rahab says 'we have really been afraid since we heard about all of these things'. And this is the crazy thing... For 40 years the nation of Israel wandered round and round the desert because of unbelief. They were afraid of the inhabitants of this land. But when you get into Canaan, you see that the inhabitants have been afraid of Israel for the same amount of time. They have both been afraid for 40 years!
It is like that for us, the enemies of our lives, the principalities that oppose us have already been defeated by a risen Christ. They have already been defeated, but it is a matter of us pressing on into the things that God has for us and taking those places by faith. We read that now there is no more courage in anyone. Then Rahab makes this wonderful statement 'For the Lord your God, He is God in heaven above and on earth beneath!' So you can see that she has come into the realization of who the true God is through His miracles and through His leading of Israel.
From: Joshua Chapter 2: Rahab - From Harlot to Hero!