I will send fire upon: In ancient times, invading armies often burned cities after they conquered them (see also Amos 1:7, 10, 12, 14; 2:2, 5). The destruction of Damascus would therefore be an act of God’s judgment on the city.
Hazael ruled as king of Damascus from about 843 to 802 BC. He took the throne by killing the previous king. Ben-hadad, Hazael’s son, ruled after him from about 802 to 792 BC.