Ezra 4:20 provides the historical proof for the warning in Ezra 4:16 — Jerusalem's kings once ruled the region, justifying the fear of losing control.

Ezra 6:8 has King Darius funding the temple rebuilding — a direct reversal of the loss predicted in Ezra 4:16, showing God's provision.

In Ezra 7:21, the same king Artaxerxes later issues a decree supporting Ezra—a complete reversal from the threat here.

2 Samuel 8:3 shows David defeating a king near the Euphrates — a concrete example of Jerusalem's king ruling the territory mentioned in Ezra 4:16.

1 Kings 4:24 describes Solomon's rule from the Euphrates — the very region that Ezra 4:16 warns the king will lose if Jerusalem is rebuilt.

In Nehemiah 2:19, enemies similarly accuse Nehemiah of rebellion, echoing the same tactic used against the earlier builders.