2 Kings 2:8-9

Then Elijah took his cloak and rolled it up and struck the water, and the water was parted to the one side and to the other, till the two of them could go over on dry ground. When they had crossed, Elijah said to Elisha, “Ask what I shall do for you, before I am taken from you.” And Elisha said, “Please let there be a double portion of your spirit on me.”