Kaushitakagrihyasutra 2.4: atha caturthaḥ khaṇḍaḥ

Now [the ritual] of the recitation [of the Veda].

To the north of the fire the two sit down: the preceptor facing east, the other facing west.

Having greeted the feet and washed the hands of the preceptor, he takes young shoots of kuśa grass by their roots.

Grasping their tips with his left hand, the preceptor sprinkles them around with water using his right.

The preceptor having said, 'Recite, sir!'

The other says, 'Teach me, sir, the Sāvitrī preceded by the syllable Oṃ and the mystical utterances!'

The preceptor says, 'I teach you the Sāvitrī preceded by the syllable Oṃ and the mystical utterances.'

The other says, 'Teach me, sir, the seers!'

The preceptor says, 'I teach you the seers.'

The other says, 'Teach me, sir, the deities!'

The preceptor says, 'I teach you the deities.'

The other says, 'Teach me, sir, the metres!'

The preceptor says, 'I teach you the metres.'

The other says, 'Teach me, sir, faith and intellect!'

The preceptor says, 'I teach you faith and intellect.'

By whatever seer, dedicated to whatever deity, or in whatever metre [a hymn] may be, he should recite each mantra accordingly.

Or, if he does not know the seer, deity, and metre, he should recite each seer or anuvāka in the very same way.

Or, in the case of short hymns, he should recite an anuvāka.

Or as much as the guru deems fit.

Or he should recite the first and last [verses] of the seer, [or] of the anuvāka.

'The first and last'—this is the standard rule.

The preceptor may, if he wishes, [recite] at the beginning of each hymn.

Thus has been explained through the recitation of the seers.

Taking the young shoots of kuśa grass with [the mantra], 'Equal to you […],' and making a basin at the base with cow-dung of a bull, he sprinkles [them] around with water as prescribed.

Then he satisfies these [with libations]: