II Kings 2:6-8

Then Elijah said to him, “Stay here, please, for the LORD has sent me on to the Jordan.” But he said, “As the LORD lives, and as your soul lives, I will not leave you!” So the two of them went on. And fifty men of the sons of the prophets went and stood facing them at a distance, while the two of them stood by the Jordan. Now Elijah took his mantle, rolled it up, and struck the water; and it was divided this way and that, so that the two of them crossed over on dry ground.