I heard from reliable sources that King Sudyumna, the son of Manu, having thus achieved femininity, remembered his familial spiritual master, Vasiṣṭha.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
एवं स्त्रीत्वमनुप्राप्तः सुद्युम्नो मानवो नृपः । सस्मार स्वकुलाचार्यं वसिष्ठमिति शुश्रुम
evaṃ strītvamanuprāptaḥ sudyumno mānavo nṛpaḥ | sasmāra svakulācāryaṃ vasiṣṭhamiti śuśruma
SB 9.1.36