2 Samuel 13:20

And Absalom her brother said unto her, Hath Amnon thy brother been with thee? but hold now thy peace, my sister: he is thy brother; regard not this thing. So Tamar remained desolate in her brother Absalom’s house.

Cross-reference

Proverbs 26:24 describes a hater disguising with lips — exactly Absalom's outward calm while harboring vengeance.

Genesis 34:2 recounts Shechem's rape of Dinah, paralleling Amnon's rape of Tamar — both provoke brotherly vengeance.