Srimad-Bhagavatam: Canto 9 - Chapter 1 - Verse 37
Sanskrit:
कालषेयं पुरोधाय तुरं तुरगमेधषाट् ।समन्तात् पृथिवीं सर्वां जित्वा यक्ष्यति चाध्वरै: ॥ ३७ ॥
ITRANS:
kālaṣeyaṁ purodhāyaturaṁ turaga-medhaṣāṭsamantāt pṛthivīṁ sarvāṁjitvā yakṣyati cādhvaraiḥ
Translation:
After conquering throughout the world and after accepting Tura, the son of Kalaṣa, as his priest, Janamejaya will perform aśvamedha-yajñas, for which he will be known as Turaga-medhaṣāṭ.