Nehemiah 13:27

Shall we then hearken unto you to do all this great evil, to transgress against our God in marrying strange wives?

Cross-reference

Ezra 10:2 Historical context

Ezra 10:2 recounts the same situation — Israelites confess marrying foreign women and seek repentance, reinforcing Nehemiah's rebuke.

1 Kings 11:4 details how Solomon's foreign wives turned his heart away — the very precedent Nehemiah cites against intermarriage.