Ahab went up to eat and to drink - Ahab, kept in painful excitement by the agonizing scene, had eaten nothing all the day. He was recommended to refresh himself without a moment’s delay; and, while the king was thus occupied, the prophet, far from taking rest, was absorbed in prayer for the fulfillment of the promise (1Ki 18:1).
put his face between his knees - a posture of earnest supplication still used.