The goal of your sermon must be to show how God has been faithful to us, and what response the Lord is calling us to. For Joshua 5:1–12, this will involve an explanation of how the events mentioned in the text testify to God’s faithfulness and also an explanation of the obedience that God expects from us in response.
1 As soon as all the kings of the Amorites who were beyond the Jordan to the west, and all the kings of the Canaanites who were by the sea, heard that the LORD had dried up the waters of the Jordan for the people of Israel until they had crossed over, their hearts melted and there was no longer any spirit in them because of the people of Israel.