Śatapatha Brāhmaṇa ("of a hundred paths") 9.3.1.12

9.3.1.12

atha yau tṛtīyau | imau tau tau samantikataraṃ juhoti samantikataramiva hīmau prāṇau vāgevāraṇye 'nūcyaḥ so 'raṇye 'nūcyo bhavati bahu hi vācā ghoraṃ nigacati

And the third pair are these two (vital airs in the nostrils). He offers them closer together, for closer together, as it were, are these two vital airs. The one to be recited in the forest is speech: it is to be recited in the forest, for by speech one gets into much terrible (trouble).