2 Kings 2:9

2 Kin. 2:9. Elijah was now about to leave the world, and as parents, when they are leaving the world, are wont to bequeath portions to their children, so Elijah asks Elisha what he shall bequeath to him. Elisha was as it were his child, and calls him father (Verse 2 Kings 2:12). That portion that he desires to inherit from his father is his spirit, and he desires a double portion of it - i.e., a much larger portion than the rest of his children, as it was ordained that the eldest son should inherit a double portion (Deuteronomy 21:17). It was his birthright to have the best share of his father's estate. Elijah had many other children besides Elisha. There were many sons of the prophets that were under Elijah's care and instruction, so that he was as it were a father among them as afterwards Elisha was, as is evident by 2 Kings 4:38. Now what Elisha desires is that he may be distinguished from all the rest of the children by having a double portion of his spirit bequeathed to him. For Elijah's estate did not consist in silver and gold, but in those gifts of the Spirit which he possessed. So that he was about to give something he might say of as Peter (Acts 3:6). He asked a double portion of this, and to be made the main heir of those blessed spiritual gifts which he had, which was accordingly granted him.

2 Kin. 2:11-13