Ramayana
न हि शक्यं स्त्रिया हन्तुं पुरुषः पापनिश्चः । शापे त्वयि मयोत्सृष्टे तपसश्च व्ययो भवेत् ॥ 7-17-32 ॥
"For it is not possible for a woman to slay a man of sinful resolve; and were a curse to be uttered by me upon you, there would come about a waste of my austerity."
english translation