Śatapatha Brāhmaṇa ("of a hundred paths") 4.5.3.10

4.5.3.10

anayā vā | yukṣvā hi keśinā harī vṛṣaṇā kakṣyaprā athā na indra somapā girāmupaśrutiṃ cara upayāmagṛhīto 'sīndrāya tvā ṣoḍaśina eṣa te yonirindrāya tvā ṣoḍaśina iti

Or with this (verse, Vâg. S. VIII, 34; Rig-veda I, 10, 3), 'Harness thy long-maned, girth-filling bay steeds! Come hither to us, O Indra, drinker of Soma, to hear our songs! Thou art taken with a support: thee to Indra Shodasin!--This is thy womb: thee to Indra Shodasin!'