As soon as the priests....set foot in the Jordan, it's waters...will be cut off. (Joshua 3:13)
The Israelites were not to wait in the camp until the Jordan was opened but to "walk by faith" (2 Cor. 5:7 KJV). They were to break camp, pack up their belongings, form a marching line, and actually step into the river before it would be opened.
If they had come down to the riverbank and then stopped, waiting for the water to divide before stepping into it, they would have waited in vain. They were told to "set foot in the Jordan" before "its waters...will be cut off."
We must learn to take God at His word and walk straight ahead in obedience, even when we can see no way to go forward. The reason we are so often sidetracked by difficulties is that we expectect to see barriers removed before we even try to pass through them.
If we would only move straight ahead in faith, the path would be opened for us. But we stand still, waiting for the obstacles to be removed, when we ought to go forward as if there were no obstacles at all. from Evening Thoughts
-excerpt from Streams in the Desert