Yoga Sūtra Chapter Three verse 38

bandha-kāraṇa-śaithilyāt-pracāra-saṃvedanāt-ca cittasya para-śarīra-āveśaḥ ||38||

Relaxation of the cause for binding and experience of maifestation,
the psyche entering other body.

bandha - bindingkāraṇa - reasons, causeśaithilya - relaxationpracāra - manifestation, appearance, coming forth, spreadingsaṃvedanā - to experience; completely knowingca - andcitta - psyche; heart as the seat of feelings and sensationspara - higher, otherśarīra - bodyāveśa - entering