Śatapatha Brāhmaṇa ("of a hundred paths") 4.2.2.16

4.2.2.16

tadu haika āhuḥ | brahmavarcasāya pavata iti tadu tathā na brūyādyadvā āhāsmai brahmaṇa iti tadeva brahmavarcasāyāha viśvebhyastvā devebhya eṣa te yonirviśvebhyastvā devebhya iti sādayati viśvebhyo hyenaṃ devebhyo gṛhṇāti taṃ vai madhye sādayatyātmā hyasyaiṣa madhya iva hyayamātmā dakṣiṇokthyasthālī bhavatyuttarādityasthālī

Here now some say, 'for spiritual lustre he becometh pure;' but let him not say so, for in saying 'for this priesthood,' he says it with a view to spiritual lustre. With, 'Thee for the All-gods! this is thy womb: thee for the All-gods!' he deposits (the cup); for it is for the All-gods that he draws it. He deposits it in the middle (of the mound); for this is his trunk, and that trunk is, as it were, in the middle. On the right (south) side of it is the Ukthya bowl, and on the left side the Âditya bowl.