II Kings 2:9

After crossing the Jordan, Elijah allowed his servant and companion to make one more request before he was taken away, in the full confidence that the Lord would fulfil it in answer to his prayer; and Elisha asked, "Let בּרוּחך פּי־שׁנים, διπλᾶ ἐν πνεύματί σου, i.e., a double portion in (of) thy spirit be granted to me." This request has been misunderstood by many translators, from Ephraem Syrus down to Kster and F. W. Krummacher, who have supposed that Elisha wished to have a double measure of Elijah's spirit ("that thy spirit may be twofold in me:" Luther after the Vulgate, "ut fiat in me duplex spiritus tuus"); and some have taken it as referring to the fact that Elisha performed many more miracles and much greater ones than Elijah (Cler., Pfeiffer, dub. vex. p. 442), others to the gift of prophecy and miracles (Kster, die Proph. p. 82), whilst others, like Krummacher, have understood by it that the spirit of Elisha, as an evangelical spirit, was twice as great as the legal spirit of Elijah. But there is no such meaning implied in the words, nor can it be inferred from the answer of Elijah; whilst it is impossible to show that there was any such measure of the Spirit in the life and works of Elisha in comparison with the spirit of Elisha, although his request was fulfilled. The request of Elisha is evidently based upon Deu 21:17, where בּ פּי־שׁנים denotes the double portion which the first-born received in (of) the father's inheritance, as R. Levi b. Gers., Seb. Mnst., Vatabl., Grot., and others have perceived, and as Hengstenberg (Beitrr. ii. p. 133f.) in our days has once more proved. Elisha, resting his foot upon this law, requested of Elijah as a first-born son the double portion of his spirit for his inheritance. Elisha looked upon himself as the first-born…

Here, I. Elijah makes his will, and leaves Elisha his heir, now anointing him to be prophet in his room, more than when he cast his mantle upon him, Kg1 19:19. 1. Elijah, being greatly pleased with the constancy of Elisha's affection and attendance, bade him ask what he should do for him, what blessing he should leave him at parting; he does not say (as bishop Hall observes), "Ask of me when I am gone, in heaven I shall be better able to befriend thee," but, "Ask before I go." Our friends on earth may be spoken to, and can give us an answer, but we know not that we can have access to any friend in heaven but Christ, and God in him. Abraham is ignorant of us. 2. Elisha, having this fair opportunity to enrich himself with the best riches, prays for a double portion of his spirit. He asks not for wealth, nor honour, nor exemption from trouble, but to be qualified for the service of God and his generation, he asks, (1.) For the Spirit, not that the gifts and graces of the Spirit were in Elijah's power to give, therefore he says not, "Give me the Spirit" (he knew very well it was God's gift), but "Let it be upon me, intercede with God for this for me." Christ bade his disciples ask what they would, not one, but all, and promised to send the Spirit, with much more authority and assurance than Elijah could. (2.) For his spirit, because he was to be a prophet in his room, to carry on his work, to father the sons of the prophets and face their enemies, because he had the same perverse generation to deal with that he had, so that, if he have not his spirit, he has not strength according to the day. (3.) For a double portion of his spirit; he does not mean double to what Elijah had, but double to what the rest of the prophets had, from whom so much would not be expected as from El…

2:9-10 A firstborn son, as the primary heir, inherited a double share of his father’s estate (Deut 21:17); Elisha asked that Elijah’s God-given spiritual abilities and privileges might continue to live through him.