Zechariah 12:3 also describes events of 'that day' — Jerusalem as a burdensome stone — sharing the same prophetic context.

Zechariah 12:4 continues the 'that day' theme with God striking enemy horses, a different aspect of the same prophecy.

Zechariah 13:1 follows with a fountain for cleansing, the direct result of the mourning and repentance here.

2 Kings 23:29 records Josiah's death at Megiddo — the historical event behind the mourning for Hadad-rimmon in Zechariah.

2 Chronicles 35:24 describes the mourning for Josiah after his death at Megiddo — the very event Zechariah uses as a measure of future mourning.

Revelation 16:16 names Armageddon (Megiddo) as the final battle site, linking to the mourning at Megiddo here.