John Gill Bible Commentary

For Isaiah had said,.... Before the above writing was made, which ends in the preceding verse; for this and the following are added by Isaiah, or some other person, taken out of Kg2 20:7. The Septuagint version adds, "to Hezekiah"; but the speech seems rather directed to some of his servants, or those that were about him: let them take a lump of figs, and lay it for a plaster upon the boil, and he shall recover; which was done, and he did accordingly recover. Aben Ezra, Jarchi, and. Kimchi, all of them say, that this was a miracle within a miracle, since figs are hurtful to ulcers; and so say others; though it is observed by some, that they are useful for the ripening and breaking of ulcers; however, it was not from the natural force of these figs, but by the power of God, that this cure was effected; for, without that, it was impossible so malignant an ulcer and so deadly a sickness as Hezekiah's were could have been cured, and especially so suddenly; nor were these figs used as a medicine, but as a sign of recovery, according to the Lord's promise, and as a means of assisting Hezekiah's faith in it.