Agniveshyagrihyasutra 2.4.9.4

2.4.9.4

atha brāhmaṇo hiraṇyena parikrīya vā dhānyena vā dhanena vā suprakṣāḷitapāṇipāda apa ācamya pavitrapāṇiḥ prāṅmukha udaṅmukho vopaviśya dakṣiṇahastāṅgulībhiḥ śliṣṭābhiḥ ṣaḍadhikena navatyā parigaṇya triguṇīkṛtamathādbhirmārjayati āpo hi ṣṭhā mayo bhuva iti tisṛbhiḥ hiraṇyavarṇāḥ śucayaḥ pāvakā iti catasṛbhiḥ pavamānaḥ suvarjana ityetenānuvākena \

Then the Brahmin, having purchased it with gold or with grain or with wealth, having his hands and feet well washed, having sipped water, holding a strainer in his hand, sitting facing east or facing north, counts out [the length] with ninety-six spans using the closed fingers of the right hand, makes it threefold, and then cleanses it with water using the three [verses] beginning with "You waters indeed are soothing," the four [verses] beginning with "Golden of color, pure, purifying," and with the section beginning with "The clarifying [Soma], generator of heaven."