Manava Dharmashastra 3.215

3.215

trīṃs tu tasmād dhaviḥśeṣāt piṇḍān kṛtvā samāhitaḥ
audakenaiva vidhinā nirvaped dakṣiṇāmukhaḥ //

But having made three cakes out of the remainder of that sacrificial food, he must, concentrating his mind and turning towards the south, place them on (Kusa grass) exactly in the same manner in which (he poured out the libations of) water.