Śatapatha Brāhmaṇa ("of a hundred paths") 2.4.2.21

2.4.2.21

atha parāṅ paryāvartate | tira iva vai pitaro manuṣyebhyastira ivaitadbhavati sa vā ā tamitorāsītetyāhuretāvānhyasuriti sa vai muhūrtamevāsitvā

He then turns round (to the left), so as to face the opposite (north) side: for the fathers are far away from men; and thereby he also is far away (from the fathers). 'Let him remain (standing with bated breath) until his breath fail,' say some, 'for thus far extends the vital energy.' However, having remained so for a moment--