God will do what He promises, through His prophets.

“Now Ahab had seventy sons in Samaria. And Jehu wrote and sent letters to Samaria, to the rulers of Jezreel, to the elders, and to those who reared Ahab’s sons, saying: Now as soon as this letter comes to you, since your master’s sons are with you, and you have chariots and horses, a fortified city also, and weapons, choose the best qualified of your master’s sons, set him on his father’s throne, and fight for your master’s house. But they were exceedingly afraid, and said, “Look, two kings could not stand up to him; how then can we stand?” And he who was in charge of the house, and he who was in charge of the city, the elders also, and those who reared the sons, sent to Jehu, saying, “We are your servants, we will do all you tell us; but we will not make anyone king. Do what is good in your sight.” Then he wrote a second letter to them, saying: If you are for me and will obey my voice, take the heads of the men, your master’s sons, and come to me at Jezreel by this time tomorrow. Now the king’s sons, seventy persons, were with the great men of the city, who were rearing them. So it was, when the letter came to them, that they took the king’s sons and slaughtered seventy persons, put their heads in baskets and sent them to him at Jezreel. Then a messenger came and told him, saying, “They have brought the heads of the king’s sons.” And he said, “Lay them in two heaps at the entrance of the gate until morning.” So it was, in the morning, that he went out and stood, and said to all the people, “You are righteous. Indeed I conspired against my master and killed him; but who killed all these? Know now that nothing shall fall to the earth of the word of the Lord which the Lord spoke concerning the house of Ahab; for the Lord has done what He spoke by His servant Elijah.” 
‭‭II Kings‬ ‭10‬:‭1‬-‭11‬ ‭NKJV‬‬