Hiranyakeshigrihyasutra 2.8.20.13

2.8.20.13

evaṃ pārāyaṇasamāptau dūrvāropaṇodadhidhāvanavarjam \13\

The same (rites are repeated) when they have finished the study of the whole Veda, with the exception of the planting of Dûrvâ grass, of (stirring up) the water, and of the race.