Jehoshaphat was very wealthy and greatly respected. He made an alliance by marriage with Ahab,

Then Elijah told Ahab, “Go on up and eat and drink, for the sound of a heavy rainstorm can be heard.” ¹ 

As for Ahab’s family, dogs will eat the ones ¹  who die in the city, and the birds of the sky will eat the ones who die in the country.”

In the fourth year of King Ahab’s reign over Israel, Asa’s son Jehoshaphat became king over Judah.

Ahab’s entire family will die. I ¹  will cut off every last male belonging to Ahab in Israel, including even the weak and incapacitated. ² 

The Lord says, ¹  ‘Look, I am ready to bring disaster ²  on you. I will destroy you ³  and cut off every last male belonging to Ahab in Israel, including even the weak and incapacitated. ⁴ 

He went to Samaria and exterminated all the members of Ahab’s family who were still alive in Samaria, ¹  just as the Lord had announced to Elijah. ² 

But when I leave you, the Lord’s spirit will carry you away so I can’t find you. ¹  If I go tell Ahab I’ve seen you, he won’t be able to find you and he will kill me. ²  That would not be fair, ³  because your servant has been a loyal follower of ⁴  the Lord from my youth.