Mahabharata 14.53.18

नागयोनौ यदा चैव तदा वर्तामि नागवत्यक्षराक्षसयोनीश्च यथावद्विचराम्यहम्

nāgayonau yadā caiva tadā vartāmi nāgavatyakṣarākṣasayonīśca yathāvadvicarāmyaham

Our plain-language meaning of this verse is waiting for scholar review.