Ramayana
बहुवर्षसहस्राणि तपश्चर्या मया कृता । नोपाश्नीयां फलं तस्या दुष्टेयं यदि मैथिली ॥ 7-96-20 ॥
"For many thousands of years has austerity been practiced by me; may I not reap the fruit of that penance if Maithili here is impure."
english translation