If the Lord do not help thee. — This is right. The marginal rendering, “Let not the Lord help thee!” — i.e., “May the Lord destroy thee!” would be possible in another context. Another rendering is, “Nay (i.e., do not supplicate me), let the Lord help thee!”
Out of the barnfloor. — Comp. Hosea ix 2.: “The floor and the winepress shall not feed them, and the new wine shall fail in her.” Jehoram, in the irony of despair, reminds the woman of what she well knows — viz., that the corn and wine, the staple foods of the time, are long since exhausted. The words, “If the Lord do not help thee,” may be compared with 2 Kings 3:10, “Alas! that the Lord hath called,” &c. The character of Jehoram is consistently drawn. But perhaps the point is: “Jehovah alone is the giver of corn and wine (Hosea 2:8-9). Appeal not to me for these.”