I Kings 22:22-25

The vision Micaiah saw was illustrating that the seductive influence of false prophets would be part of God's judgment on Ahab. The imagery is that of a council of war, with the heavenly King sitting on His throne surrounded by His army, making plans to defeat Ahab in battle.

So Micaiah is predicting that that is what he will do because that is what God told him he would do. And that would prove that Micaiah had God's Spirit and Zedekiah did not. In verse 23, Micaiah claimed that Zedekiah and his colleagues had a lying spirit, and Zedekiah responds that he had been influenced by the Spirit of the Lord, who cannot have been speaking to both him and Micaiah. Whether or not God sent an angel in disguise, He used the system of false prophets to ensnare Ahab in his sin. The lying spirit symbolized the way of life for these prophets who told the king only what he wanted to hear, and all will become clear, Micaiah claims, when the disaster that he is predicting eventually falls and Zedekiah is forced to hide in the city in someone's home.