Agniveshyagrihyasutra 1.3.3.6

1.3.3.6

athobhayīrapaḥ sanniṣiñcati uṣṇāsu śītā ānayati devamānuṣasya vyāvṛttyā iti tāsāmañjalinā trirabhiṣiñcati āpo hi ṣṭhā mayobhuva iti tisṛbhiḥ hiraṇyavarṇāḥ śucayaḥ pāvakā iti catasṛbhiḥ ṣoḍhā vihito vai puruṣa ityetasmād brāhmaṇāt \

Then he pours both kinds of water together, [and] pours cold into hot with: 'For distinguishing the divine and the human.' He pours [water] over him three times with folded hands with the three [verses]: 'Waters, you indeed are comforting,' and the four [verses]: 'Golden of color, pure, purifying,' because of this Brāhmaṇa [passage]: 'Sixfold indeed is man constituted.'