Elisha watches Elijah ascend to heaven (by Gustave Doré)
Man of God is a biblical title of respect applied to prophets and beloved religious leaders. The term appears 78 times in 72 verses of the Bible, in application to up to 13 individuals:
The man from Judah who cried out against King Jeroboam of Israel (1 Kings 13:1 (twice), 4, 5, 6 (twice), 7, 8, 11, 12, 14 (twice), 21, 26, 29, 31), whose tomb King Josiah protected and preserved when he destroyed the idolatrous tombs in Bethel (2 Kings 23:16, 17) and whom some rabbis identify as Iddo (Sifre to Deuteronomy 342:4; Pesikta de-Rav Kahana 2:85; Zohar 2:64a)
The man who told King Ahab of Israel that Israel could defeat the Arameans (1 Kings 20:28) whom Sifre identifies as Micah (Sifre to Deut. 342:4), but who from context might also be Elijah
The man who warned King Amaziah of Judah not to go to war (2 Chronicles 25:7, 9 (twice)), whom some rabbis identify as Amoz (Sifre to Deut. 342:4; Seder Olam Rabbah 20)