Mahabharata 7.172.81

तावेतौ पूर्वदेवानां परमोपचितावृषीलोकयात्राविधानार्थं संजायेते युगे युगे

tāvetau pūrvadevānāṃ paramopacitāvṛṣīlokayātrāvidhānārthaṃ saṃjāyete yuge yuge

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