Midrash su II Re 4:20

Rabbi Zechariah said: "He will fulfil the desire of them that fear him" (Ps. 145:19). The Holy One, blessed be He, fulfilled the desire of the prophet. She conceived and bare, and the child grew. He went forth to refresh himself, and to look at the reapers. A mishap overtook him, and he died, as it is said, "It fell on a day, that he went out to his father to the reapers" (2 Kings 4:18); this restrained them (from work) until he came (among them), and he died, as it is said, "And he sat on her knees till noon, and then died" (2 Kings 4:20).

(Bamidbar 30:3) "A man, if he vow a vow, etc.": "A man": to exclude a minor. — But this would exclude (both) a minor and one who is thirteen years and one day old! — It follows (by induction that it does not), viz.: It is written here "vow," and elsewhere (Ibid. 6:2) "vow." Just as there, "ki yafli" (i.e., if he can clearly articulate his vow), so, here — whence it was ruled: If he were thirteen years and one day old, his vows stand. If he were twelve years and one day old, his vows are examined (for the yafli factor). "if he vow a vow": (The meaning is:) If he "supports" his vow by something that is vowed (e.g., "I vow not to eat X just as (I am forbidden to eat) an offering" [i.e., something that is vowed]), it is a vow. Otherwise, it is not a vow. — But perhaps (the meaning is) that it is not a vow until he appends to it (Ibid.) "to the L-rd"? It is, therefore, written (Ibid. 6:2) "to vow a vow" — in any event (i.e., even without appending "to the L-rd.") — But perhaps, just as with vows, if he supports his vow by something which is a vow, it is a vow, and, otherwise, not — so with oaths? It is, therefore, written (in respect to oaths) (Ibid. 30:3) "to bind a bond" — in any event (i.e., even without such support). Why is there a difference between vows and oaths (in this regard)? Vows are like vowing by the life of the king. Oaths, (in that they must be in the name of the L-rd) are like swearing by the King Himself. And even though there is no proof for this (distinction) it is intimated in (II Kings 4:20) "As the L-rd lives, and as you (King David) live." "to bind a bond upon his soul": Upon his soul he binds (i.e., forbids), but he does not bind upon others (i.e., his wife [i.e., he cannot confirm (in advance of her making them) all the vows that his wife will make (in his absence)]. For it would follow otherwise, viz.: If where he cannot annul his own vows once he has made them, he can annul his own vows before he has made them, then where he can annul his wife's vows once she has made them, how much more so can he annul his wife's vows before she has made them! And if he can do this, it follows that he can confirm them before she makes them. In the words of R. Eliezer: I might think that just as he can annul (her vows) before she makes them, so can he confirm them before she makes them — it is, therefore, written "to bind a bond upon his soul" — Upon his soul he binds, but he does not bind upon others.