2 Kings 2:6-10 (KJV)
6 And Elijah said unto him, Tarry, I pray thee, here; for the Lord hath sent me to Jordan. And he said, As the Lord liveth, and as thy soul liveth, I will not leave thee. And they two went on.
7 And fifty men of the sons of the prophets went, and stood to view afar off: and they two stood by Jordan.
8 And Elijah took his mantle, and wrapped it together, and smote the waters, and they were divided hither and thither, so that they two went over on dry ground.
9 And it came to pass, when they were gone over, that Elijah said unto Elisha, Ask what I shall do for thee, before I be taken away from thee. And Elisha said, I pray thee, let a double portion of thy spirit be upon me.
10 And he said, Thou hast asked a hard thing: nevertheless, if thou see me when I am taken from thee, it shall be so unto thee; but if not, it shall not be so.