מלכים א, פרק י״ח, פסוק מ״ד

After a long period of anticipation, a dramatic turning point arrives. Six times the servant looked toward the sea with no result, but the seventh attempt brings news of a small cloud rising from the water. Recognizing the significance of this sign, Elijah immediately sends his servant with an urgent message for King Ahab. The instruction to go up to the king suggests that Ahab was positioned at a higher elevation on the mountain, having gone up earlier to eat and drink [רד״ק].

The message delivered to the king is a call for swift action. He is told to harness his horses to his chariot and quickly descend from Mount Carmel to return to his home in Jezreel [רש״י, רד״ק, מצודת ציון, ביאור שטיינזלץ]. The reason for such urgency is the sheer intensity of the coming weather. The commentators agree that Elijah is warning Ahab about the massive volume of the impending downpour. If the king delays, the heavy rains will wash out and block the roads, completely preventing his travel. To avoid being trapped on the mountain, Ahab must prepare his chariot and depart immediately before the severe storm begins [רש״י, מצודת דוד, רלב״ג, רד״ק].