Shatapatha Brahmana 5.4.5.15

5.4.5.15

atha rājānaṃ krītvā | dvedhopanahya parivahanti tato 'rdhamāsandyāmāsādya pracaratyatha ya eṣo 'rdho brahmaṇo gṛhe nihito bhavati tamāsandyāmāsādyātithyena pracarati yadātithyena pracaratyathopasadbhiḥ pracarati yadopasadbhiḥ pracarati

And having bought the King (Soma), and tied him up in two parts, they drive him around. Having then placed one-half on the throne-seat, he proceeds therewith. Having then placed on the throne-seat that portion which was deposited in the Brahman's house, he proceeds with the guest-meal. Whilst he is proceeding with the guest-meal, he performs the Upasads. Whilst he is performing the Upasads,--