Albert Barnes Commentary Joshua 2:11

"And as soon as we had heard it, our hearts did melt, neither did there remain any more spirit in any man, because of you: for Jehovah your God, he is God in heaven above, and on earth beneath." — Joshua 2:11 (ASV)

The Lord your God, he is God - From the report of God’s miraculous interventions Rahab believed, and makes the very same confession to which Moses endeavors to bring Israel by recounting similar arguments (Deuteronomy 4:39).

Rahab had only heard of what Israel had experienced. Her faith then was ready. It is noteworthy, too, that the same reports which work faith and conversion in the harlot, cause only terror and astonishment among her countrymen. (Compare to Luke 8:37-39.)