Śrāddha-kalpa: Dāna-phala-nirdeśa
Gifts in Śrāddha and Their Fruits
दत्त्वा न शोचते श्राद्धे वर्षासु च मघासु च / घृतेन भोजयेद्विप्रान्घृतं भूमौ समुत्सृजोत्
dattvā na śocate śrāddhe varṣāsu ca maghāsu ca / ghṛtena bhojayedviprānghṛtaṃ bhūmau samutsṛjot
By giving at the śrāddha, in the rainy season, and at the time of the Maghā asterism, one does not grieve; let him feed the brāhmaṇas with ghee, and offer/pour ghee upon the earth.