Answer: The most important thing for them is to keep the border because it should be that all the people go through dry land. As was the crossing of the Red Sea, so it is here when crossing the Jordan. After everyone had passed, the functions of the priests were fulfilled at the moment and the waters closed again.
Comment: In some ways, this is similar to how Moses told Pharaoh that he would take everyone and wait until everyone came out.
My Response: But there was an exit from Malchut to Bina through Zeir Anpin—to the intermediate state of “desert.” Here there is a transition to Bina, to the property of bestowal.
From KabTv’s “Secrets of the Eternal Book” 7/5/21