Śatapatha Brāhmaṇa ("of a hundred paths") 5.3.5.1

5.3.5.1

taṃ vai mādhyadine savane 'bhiṣiñcati | eṣa vai prajāpatirya eṣa yajñastāyate yasmādimāḥ prajāḥ prajātā etamvevāpyetarhyanu prajāyante tadenam madhyata evaitasya prajāpaterdadhāti madhyataḥ suvati

He consecrates him at the midday Soma-feast. Now Pragâpati is that sacrifice which is here performed, and whence these creatures have been produced,--and so they are even now produced after this one: he thus places him in the very middle of that Pragâpati, and consecrates him in the middle.