Matsyapurana 17.58

17.58

pitṛbhir nirmitaṃ pūrvam etadāpyāyanaṃ sadā
aputrāṇāṃ saputrāṇāṃ strīṇāmapi narādhipa //

"Uchchheṣaṇa" is to leave some food scattered on the floor, for the acceptance of the attendants of the Pitṛis known as Âstika and Akutila. The Pitṛis themselves started this rite for the satisfaction of their attendants which should be performed by all—those who have children and those who are childless.—56-58.