Mbh 13.91.1

"'Yudhishthira said, "By whom was the Sraddha first conceived and at what time? What also is its essence? During the time when the world was peopled by only the descendants of Bhrigu and Angiras, who was the muni that established the Sraddha? What acts should not be done at Sraddha? What are those Sraddhas in which fruits and roots are to be offered? What species also of paddy should be avoided in Sraddhas? Do thou tell me all this, O grandsire!"