וַתִּקַּ֨ח תָּמָ֥ר אֵ֙פֶר֙ עַל־רֹאשָׁ֔הּ וּכְתֹ֧נֶת הַפַּסִּ֛ים אֲשֶׁ֥ר עָלֶ֖יהָ קָרָ֑עָה וַתָּ֤שֶׂם יָדָהּ֙ עַל־רֹאשָׁ֔הּ וַתֵּ֥לֶךְ הָל֖וֹךְ וְזָעָֽקָה׃
And Tamar put ashes on her head, and rent her garment of many colours that was on her; and she laid her hand on her head, and went her way, crying aloud as she went.
Read halakhic rulings (Jewish law) on II Samuel 13:19: and classical halakhic sources.