1st book of Kings 18:41-46.
Elijah then said to Ahab, “Go up, eat and drink, for there is the sound of a heavy rain.”
So Ahab went up to eat and drink, while Elijah climbed to the top of Carmel, crouched down to the earth, and put his head between his knees.
“Climb up and look out to sea,” he directed his servant, who went up and looked, but reported, “There is nothing.” Seven times he said, “Go look again!”
And the seventh time the youth reported, “There is a cloud as small as a man’s hand rising from the sea.” Elijah said, “Go and say to Ahab, ‘Harness up and leave the mountain before the rain stops you.'”
In a trice, the sky grew dark with clouds and wind, and a heavy rain fell. Ahab mounted his chariot and made for Jezreel.
But the hand of the LORD was on Elijah, who girded up his clothing and ran before Ahab as far as the approaches to Jezreel.