The account you mention is about Elijah's message to King Ahab and Jezebel, the resulting drought brought on by their idolatry(1Kings 16:30-33)(1 Kings 18:18-19), and the protection afforded Elijah as he carried out Yahweh's commands.
It teaches us several things:
*First, that God tolerates no rivalry and does not condone worship of false Gods.
*Second, what God says will happen, WILL happen (Luke 4:25)(James 5:17)
*Third, that God will provide instruction on survival
*Fourth, that God WILL protect his loyal ones who are obedient to his word
Yahweh used the drought to discredit Baal, Ahab's false God, who was believed to be the 'owner of the sky'and the 'giver of rains and fertility'. This drought proved Baal powerless.
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