River and stones

In the book of Joshua, chapter 3, the Israelites prepare to cross the Jordan River.  The priests carrying the Covenent Box--containing the tablets of the Ten Commandments--went ahead of everyone.  They stopped at the mighty river, and when they did the river stopped flowing.  This was done in much the same way as the Israelites did at the Red Sea with Moses.

Once the Covenent Box was across, the rest of the people went afterwards, prepared for war.

In chapter 4, much emphasis is made on twelve stones to be placed where the priests stood as the river stopped flowing.  Twelve stones, representing the twelve tribes that make up the Israelites, were gathered by the leaders of the twelve tribes.  They were to be set up as a reminder of what the Lord did for the Israelites that day as they crossed the river into the land God promised them so long ago.