Patanjali Yoga Sutra 3.39

Sanskrit Sutra

बन्धकारणशैथिल्यात् प्रचारसंवेदनाच्च चित्तस्य परशरीरावेशः॥३९॥

Swami Vivekananda's translation

When the cause of bondage of the Chitta has become loosened, the Yogi, by his knowledge of its channels of activity (the nerves), enters another’s body.

Vyasa Bhashya (Sanskrit)

लोलीभूतस्य मनसोऽप्रतिष्ठस्य शरीरे कर्माशयवशाद्बन्धः प्रतिष्ठेत्यर्थः। तस्य कर्मणो बन्धकारणस्य शैथिल्यं समाधिबलाद्भवति। प्रचारसंवेदनं च चित्तस्य समाधिजमेव। कर्मबन्धक्षयात्स्वचित्तस्य प्रचारसंवेदनाच्च योगी चित्तं स्वशरीरान्निष्कृष्य शरीरान्तरेषु निक्षिपति। निक्षिप्तं चित्तं चेन्द्रियाण्यनुपतन्ति। यथा मधुकरराजानं मक्षिका उत्पतन्तमनूत्पतन्ति निविशमानमनुनिविशन्ते तथेन्द्रियाणि परशरीरावेशे चित्तमनुविधीयन्त इति ॥ ३८ ॥

Vyasa Bhashya (English Translation)

The fickle and unsteady mind becomes bound or established in the body due to the repository of karma (karmashaya). The loosening of that karma, which is the cause of bondage, occurs through the power of Samadhi. And the knowledge of the channels of activity of the mind also comes from Samadhi. Through the destruction of karmic bondage and the knowledge of the mind’s channels, the yogi can extract his mind from his own body and project it into other bodies. The senses follow the projected mind. Just as when the king bee flies up, the other bees follow him, and when he settles down, they also settle down, similarly, the senses follow the mind when it enters another body. || 38 ||

Chapter link: Yoga Sutra Chapter 3