Mircea Eliade - Hindu beliefs on death
Type of spiritual experience
A description of the experience
Mircea Eliade – Shamanism Archaic techniques of ecstasy
And it was also known that the soul of the deceased did not leave the earth immediately; it lingered about the house for a certain period which might be as much as a year. This explains too, why it was invoked during the sacrifices and offerings were made in its honour.
Source Arthur Berriedale Keith – The Religion and Philosophy of the Veda and Upanishads