Agniveshyagrihyasutra 2.6.7.7

2.6.7.7

devavihitāṃ pūjāṃ kṛtvā gomayena gocarmamātraṃ caturaśraṃ sthaṇḍilamupalipya kṣatriyasya trikoṇamupalipya vaiśyasya vṛttamupalipya bhojanaṃ kurute \

Having performed the worship prescribed for the gods, having smeared with cow dung a square ground measuring a cow-hide, having smeared a triangle for a Kṣatriya, and having smeared a circle for a Vaiśya, he takes his meal.