O King Parīkṣit, as soon as Sudyumna, who was expert in subduing enemies, entered the forest, he saw himself transformed into a female and his horse transformed into a mare.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
तस्मिन् प्रविष्ट एवासौ सुद्युम्नः परवीरहा । अपश्यत्स्त्रियमात्मानमश्वं च वडवां नृप
tasmin praviṣṭa evāsau sudyumnaḥ paravīrahā | apaśyatstriyamātmānamaśvaṃ ca vaḍavāṃ nṛpa
SB 9.1.26