וַיֹּ֨אמֶר אֵלֶ֜יהָ אַבְשָׁל֣וֹם אָחִ֗יהָ הַאֲמִינ֣וֹן אָחִיךְ֮ הָיָ֣ה עִמָּךְ֒ וְעַתָּ֞ה אֲחוֹתִ֤י הַחֲרִ֙ישִׁי֙ אָחִ֣יךְ ה֔וּא אַל־תָּשִׁ֥יתִי אֶת־לִבֵּ֖ךְ לַדָּבָ֣ר הַזֶּ֑ה וַתֵּ֤שֶׁב תָּמָר֙ וְשֹׁ֣מֵמָ֔ה בֵּ֖ית אַבְשָׁל֥וֹם אָחִֽיהָ׃
And Absalom her brother said unto her: ‘Hath Amnon thy brother been with thee? but now hold thy peace, my sister: he is thy brother; take not this thing to heart.’ So Tamar remained desolate in her brother, Absalom’s house.
Read midrashic interpretation of II Samuel 13:20: and classical rabbinic exegesis.