Agniveshyagrihyasutra 2.4.10.31

2.4.10.31

athāvaraṇaṃ karoti amṛtāpidhānamasi ityapa ānīya pidhāya yo 'pāmāyatanaṃ veda \

Then he makes the covering: reciting "You are the cover of nectar," having brought water and covered [it], "He who knows the abode of the waters...