New Defender's Study Bible Notes
13:1 did see. Isaiah 13–23 consists of a series of “burdens” or “prophecies of doom” against various pagan nations. This introductory verse says Isaiah “did see” these things, though they were all far in the future. Evidently, God gave him a series of visions, projecting him into the future, so he could see the events as actually taking place before his eyes.