Jeremiah 47:7

Then Jeremiah remembered that the Lord’s sword (the invader from the north) had to continue to slay the Philistines until it had finished the job He had given it to do. Nebuchadnezzar may have fulfilled this prophecy in 604 B.C. when he destroyed Ashkelon. [Note: See Wiseman, pp. 68-69.] It was the sacking of Ashkelon at this time that moved the people in Jerusalem to fast during Jehoiakim’s reign, which led to the reading, followed by the burning, of Jeremiah’s scroll (cf. ch. 36).

"A Babylonian prism, now in Istanbul, mentions the presence-presumably with little choice in the matter-of the kings of Tyre and Sidon (cf. Jeremiah 47:4), of Gaza (5) and of Ashdod, at the court of Nebuchadrezzar; while a prison list now in Berlin records the rations for the king of Ashkelon (5), among other noted prisoners (including Jehoiachin of Judah)." [Note: Kidner, p. 141. See Pritchard, ed., p. 308, for extracts from both lists.]