I will send a fire... — Compare Jeremiah 49:27, where this language is repeated at a time when punishment had fallen for a while on Damascus, and she had become, as Isaiah predicted, “a ruinous heap” (Isaiah 17:1).
Related Commentaries of Amos 1:4
Amos 1:4
4 But I will send a fire into the house of Hazael, which shall devour the palaces of Benhadad.