Jamieson, Fausset and Brown on 1 Kings 20:35-38

35-38. Smite me--This prophet is supposed (1Ki 20:8) to have been Micaiah. The refusal of his neighbor to smite the prophet was manifestly wrong, as it was a withholding of necessary aid to a prophet in the discharge of a duty to which he had been called by God, and it was severely punished [1Ki 20:36], as a beacon to warn others (see on 1Ki 13:2-24). The prophet found a willing assistant, and then, waiting for Ahab, leads the king unconsciously, in the parabolic manner of Nathan (2Sa 12:1-4), to pronounce his own doom; and this consequent punishment was forthwith announced by a prophet (see on 1Ki 21:17).