Shiva Purana
स्वगृह्योक्तेन मार्गेण दद्यात्पिण्डान्पृथक्पृथक् ॥ दद्यादिदं साक्षतं च पितृसाङ्गुण्यहेतवे ॥ ७६ ॥
The Piṇḍas shall be given separately along with Akṣatas for the full efficacy of the Pitṛs as explained in the Gṛhyasūtra.
english translation
svagRhyoktena mArgeNa dadyAtpiNDAnpRthakpRthak ॥ dadyAdidaM sAkSataM ca pitRsAGguNyahetave ॥ 76 ॥
hk transliteration by Sanscript