Agniveshyagrihyasutra 3.11.2.2

3.11.2.2

avyuṣṭe kāle brāhmaiṇamāhūya kiñciddattvā nivedyānumantrayate śvobhūte 'nnaṃ saṃskṛtya luptaśmaśrulomanakhāya brāhmaṇāya dantakāṣṭhaṃ dattvā dhanadhānyapātraṃ saṃspṛṣṭvā deśe pātrāṇītyādi dattvā brāhmaṇamudaṅmukhamupaveśayet \

At daybreak, having summoned a Brahmin and given him something, having announced [the rite], he addresses him with a formula: having prepared food for the next day, having given a tooth-stick to the Brahmin whose beard, body hair, and nails have been shaved, having touched the vessel of wealth and grain, having given vessels, etc. in [the proper] place, he should seat the Brahmin facing north.