 According to the Midrash, Jael engaged in sexual intercourse with Sisera seven times, but because she was attempting to exhaust him in order to kill him, her sin was for Heaven's sake and therefore praiseworthy.Also according to the Midrash, Sisera had previously conquered every country against which he had fought.His voice was so strong that, when he called loudly, the most solid wall would shake and the wildest animal would fall dead.