“So they both (Eliyahu and Elisha) went. Fifty men of the prophets' disciples went , standing opposite them at a distance, and the two of them stood at the Jordan (River).
Eliyahu took his mantle and folded it over, and struck the water, which split apart this way and that, and they both crossed over on dry land. As they were crossing, Eliyahu said to Elisha,
‘Request what I should do for you before I am taken away from you.’
Elisha said, ‘May twice as much as your spirit be mine.’
(Eliyahu) said, ‘You have made a difficult request. If you see me taken from you, it shall be so for you; but if you do not, then it will not happen.’
As they were walking and conversing, behold! - a chariot of fire and horses (appeared) and separated between the two of them, and Eliyahu ascended to Heaven in the Whirlwind.” Yishyah/Isaiah 55:10
Eliyahu was a prophet of amazing talents and power during the reign of the evil king of Israel, Ahab. Though the King and his wife, Jezebel, threatened to have him killed, he obeyed G-d and followed the prophecies given to him. Eliyahu was able to raise a young boy from the dead, challenge and destroy hundreds of idol-worshiping false prophets, part the Jordan River, and ascend to Heaven in a fiery chariot. Since Eliyahu did not “die” per se, Jews to this day invite him annually to the Seder table at Passover, hoping that he brings the prophecy of the coming of the Moshiach/Messiah.
Text from the calendar "Hebrew Illuminations"