1 Kings 18:44

And it came to pass at the seventh time that he said, behold
there ariseth a little cloud out of the sea, like a man's hand
Either about the size or in the form of it; rain water comes out of the sea, and, being strained through the clouds and air, becomes fresh:

and he said, go up:
the meaning seems to be, that he should first go down from the mount, and then go up to that part of it where Ahab was:

say unto Ahab, prepare thy chariot;
bind or fasten the horses to it, as the phrase seems to signify:

and get thee down;
from the mountain where he was, to go to Jezreel, which lay low in a valley:

that the rain stop thee not;
on the road, that might be made impassable by it, signifying that such abundance should fall as would make it so.