Agniveshyagrihyasutra 2.6.2.19

2.6.2.19

āpo hi ṣṭhā mayo bhuva iti tisṛbhiḥ hiraṇyavarṇāḥ śucayaḥ pāvakā iti catasṛbhiḥ pavamānaḥ suvarjana ityetenānuvākena mārjayitvāntarjalagato 'ghamarṣaṇena trīn prāṇāyāmān dhārayitvottīrya vāsaḥ pīḍayitvā prakṣālitopavātānyakliṣṭāni vāsāṃsi paridhāyāpa ācamya darbheṣvāsīno darbhān dhārayamāṇaḥ sāvitrīṃ sahasrakṛtva āvartayecchatakṛtvo vā daśāvaramiti \

with the three [verses beginning with] "āpo hi ṣṭhā mayo bhuvaḥ", with the four [beginning with] "hiraṇyavarṇāḥ śucayaḥ pāvakāḥ", and having wiped [himself] with this section, "pavamānaḥ suvarjanaḥ", standing submerged in the water, performing three breath controls with the Aghamarṣaṇa [hymn], stepping out of the water, wringing out his garment, putting on washed, air-dried, unstained garments, having sipped water, seated upon darbha grass, holding darbha grass, he should repeat the Sāvitrī verse a thousand times, or a hundred times, or at the least ten times.