What reports about God's power had the people of Jericho heard?
The people of Jericho had heard how God destroyed Egypt, how He destroyed the king of Moab, and how He defeated all who tried to oppose Israel; they also heard that Israel was great in number. They could see the millions encamped across the Jordan.
Les explains that the inhabitants of Jericho could look out across the Jordan and see the millions of Israelites encamped. They had already heard everything that had happened for the last 40 years concerning this people. They had heard how God destroyed Egypt, how He destroyed the king of Moab, and all the things that tried to oppose them, and how they were so great in number. This background precedes the spies entering Rahab's house on the wall.