וַיִּשְׂא֨וּ אֶת־עֵינֵיהֶ֤ם מֵרָחוֹק֙ וְלֹ֣א הִכִּירֻ֔הוּ וַיִּשְׂא֥וּ קוֹלָ֖ם וַיִּבְכּ֑וּ וַֽיִּקְרְעוּ֙ אִ֣ישׁ מְעִל֔וֹ וַיִּזְרְק֥וּ עָפָ֛ר עַל־רָאשֵׁיהֶ֖ם הַשָּׁמָֽיְמָה׃
And when they lifted up their eyes afar off, and knew him not, they lifted up their voice, and wept; and they rent every one his mantle, and threw dust upon their heads toward heaven.
Read halakhic rulings (Jewish law) on Job 2:12: and classical halakhic sources.