2 Kings 2:9-11

Young's Literal Translation

⁹ And it cometh to pass, at their passing over, that Elijah hath said unto Elisha, `Ask, what do I do for thee before I am taken from thee?' and Elisha saith, `Then let there be, I pray thee, a double portion of thy spirit unto me;'

¹⁰ and he saith, `Thou hast asked a hard thing; if thou dost see me taken from thee, it is to thee so; and if not, it is not.'

¹¹ And it cometh to pass, they are going, going on and speaking, and lo, a chariot of fire, and horses of fire, and they separate between them both, and Elijah goeth up in a whirlwind, to the heavens.