Mahabharata 12.326.82
द्वापरस्य कलेश्चैव संधौ पर्यवसानिकेप्रादुर्भावः कंसहेतोर्मथुरायां भविष्यति
dvāparasya kaleścaiva saṃdhau paryavasānikeprādurbhāvaḥ kaṃsahetormathurāyāṃ bhaviṣyati
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book