Srimad-Bhagavatam: Canto 9 - Chapter 1 - Verse 36
Sanskrit:
एवं स्रीत्वमनुप्राप्त: सुद्युम्नो मानवो नृप: ।सस्मार स कुलाचार्यं वसिष्ठमिति शुश्रुम ॥ ३६ ॥
ITRANS:
evaṁ strītvam anuprāptaḥsudyumno mānavo nṛpaḥsasmāra sa kulācāryaṁvasiṣṭham iti śuśruma
Translation:
I heard from reliable sources that King Sudyumna, the son of Manu, having thus achieved femininity, remembered his familial spiritual master, Vasiṣṭha.