Once upon a time, Pūtanā Rākṣasī, who could move according to her desire and was wandering in outer space, converted herself by mystic power into a very beautiful woman and thus entered Gokula, the abode of Nanda Mahārāja.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
सा खेचर्येकदोपेत्य पूतना नन्दगोकुलम् । योषित्वा माययाऽऽत्मानं प्राविशत्कामचारिणी
sā khecaryekadopetya pūtanā nandagokulam | yoṣitvā māyayā''tmānaṃ prāviśatkāmacāriṇī
SB 10.6.4