Shatapatha Brahmana 4.5.9.9

4.5.9.9

taṃ gṛhītvā na sādayati | prāṇā vai grahā netprāṇānmohayānīti mohayeddha prāṇānyatsādayettaṃ dhārayanta evopāsate 'tha grahān gṛhṇātyatha yadā grahān gṛhṇātyatha yatraivaitasya kālastadenaṃ hiṃkṛtya sādayati

Having drawn it, he does not deposit it--the grahas being the vital airs--lest he should disorder the vital airs; for he would indeed disorder the vital airs, were he to deposit it. They sit near holding that (cup); and he draws the (other) cups; and while he draws the cups, when the time of that (cup comes), he utters 'Him' and deposits it.