Manusmriti
पिण्डनिर्वपणं के चित् परस्तादेव कुर्वते । वयोभिः खादयन्त्यन्ये प्रक्षिपन्त्यनलेऽप्सु वा ॥ २६१ ॥
Some make the offering of the cakes after (the dinner); some cause (them) to be eaten by birds or throw them into fire or into water.
english translation
piNDanirvapaNaM ke cit parastAdeva kurvate । vayobhiH khAdayantyanye prakSipantyanale'psu vA ॥ 261 ॥
hk transliteration by Sanscript