2 Kings 2:9-11

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.” As they continued along and talked, behold, a chariot of fire with horses of fire [appeared suddenly and] separated the two of them, and Elijah went up to heaven in a whirlwind.