וַיְהִ֣י אַֽחֲרֵי־כֵ֗ן וּלְאַבְשָׁל֧וֹם בֶּן־דָּוִ֛ד אָח֥וֹת יָפָ֖ה וּשְׁמָ֣הּ תָּמָ֑ר וַיֶּאֱהָבֶ֖הָ אַמְנ֥וֹן בֶּן־דָּוִֽד׃
And it came to pass after this, that Absalom the son of David had a fair sister, whose name was Tamar; and Amnon the son of David loved her.
Read Kabbalistic (mystical) interpretations of II Samuel 13:1: Zohar and classical Jewish mystical sources, free online.