Hiranyakeshigrihyasutra 1.3.10.2

1.3.10.2

athoṣṇaśītābhiradbhiḥ snāpayati \ āpo hi ṣṭhā mayobhuvaḥ \ iti tisṛbhiḥ \ hiraṇyavarṇāḥ śucayaḥ pāvakāḥ \ iti catasṛbhiḥ \ pavamānaḥ suvarjanaḥ \ iti caitenānuvākena \2\

Then (the teacher) makes him wash himself with lukewarm water, with the three verses, 'O waters, ye are wholesome' (Taitt. Samh. IV, I, 5, 1), with the four verses, 'The gold-coloured, clean, purifying (waters)' (Taitt. Samh. V, 6, 1), and with the Anuvâka, 'The purifier, the heavenly one' (Taitt. Brâhmana I, 4, 8).