Jos 2:9-11 and said to the men, “I know that the LORD has given you the land, and that the fear of you has fallen upon us, and that all the inhabitants of the land melt away before you. For we have heard how the LORD dried up the water of the Red Sea before you when you came out of Egypt, and what you did to the two kings of the Amorites who were beyond the Jordan, to Sihon and Og, whom you devoted to destruction. And as soon as we heard it, our hearts melted, and there was no spirit left in any man because of you, for the LORD your God, he is God in the heavens above and on the earth beneath.
2 Kings 5:15 Then he returned to the man of God, he and all his company, and he came and stood before him. And he said, “Behold, I know that there is no God in all the earth but in Israel
Job 19:25 For I know that my Redeemer lives, and at the last he will stand upon the earth.
Ecclesiastes 8:12 Though a sinner does evil a hundred times and prolongs his life, yet I know that it will be well with those who fear God, because they fear before him.
Jeremiah 27:5 “It is I who by my great power and my outstretched arm have made the earth, with the men and animals that are on the earth, and I give it to whomever it seems right to me.
Nahum 2:10 Desolate! Desolation and ruin! Hearts melt and knees tremble; anguish is in all loins; all faces grow pale!
Isaiah 13:7 Therefore all hands will be feeble, and every human heart will melt.
Rahab’s faith is shown by this expression. What God willed she regarded as already done. To speak of the future as of a past already fulfilled, is faith. (Unknown)
God had already been speaking to Rahab in some way, and she had begun to believe in the superiority of Yahweh (the LORD), the God of Israel. God continues to speak in remarkable and unusual ways to unlikely people who are seemingly distant from the gospel. Rahab’s confession of faith included recognition that God had promised the land of Canaan to Israel and that He would fulfill that promise. She saw God’s supernatural work of causing terror among the Canaanites, leading them to be fainthearted.
In her confession of faith Rahab reported that the people of Jericho had heard of and believed the mighty works God did for Israel in freeing them from Egypt (dried up the water of the Red Sea) and defeating their enemies along the way (what you did to the two kings).
Many among the Canaanites believed that the God of Israel: Was greater than their Canaanite gods. Did miracles for His people, bringing them out of Egypt. Had recently enabled Israel to defeat kings. Had promised Israel the land of Canaan. Believing these things made many among the Canaanites lose all courage; yet few of them acted in faith as Rahab the harlot did. Rahab showed admirable faith. (Guzik)
“This confession of the true God is amazingly full, and argues considerable light and information. As if she had said, ‘I know your God to be omnipotent and omnipresent:’ and in consequence of this faith she hid the spies, and risked her own life in doing it.” (Clarke)