2 Kings 2:9-10

And when they had crossed over, Elijah said to Elisha, “Ask what I shall do for you before I am taken from you.” And Elisha said, “Please let a double portion of your spirit be upon me.” He said, “You have asked for a difficult thing. However, if you see me when I am taken from you, it shall be so for you; but if not, it shall not be so.”