Mahabharata 12.159.50

एवं वा तपसा युक्तो ब्रह्महा सवनी भवेत्एवं वा गर्भमज्ञाता चात्रेयीं योऽभिगच्छतिद्विगुणा ब्रह्महत्या वै आत्रेयीव्यसने भवेत्

evaṃ vā tapasā yukto brahmahā savanī bhavetevaṃ vā garbhamajñātā cātreyīṃ yo'bhigacchatidviguṇā brahmahatyā vai ātreyīvyasane bhavet

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