Śatapatha Brāhmaṇa ("of a hundred paths") 13.4.1.8

13.4.1.8

catasro jāyā upakLptā bhavanti mahiṣī vāvātā parivṛktā pālāgalī sarvā niṣkinyo'laṅkṛtā mithunasyaiva sarvatvāya tābhiḥ sahāgnyagāram prapadyate pūrvayā dvārā yajamāno dakṣiṇayā patnyaḥ

Four (of the king's) wives are in attendance--the consecrated queen, the favourite wife, a discarded wife, and the Pâlâgalî, all of them adorned and wearing gold ornaments (neck-plates)--with the view of the completeness of conjugal union. With them he enters the hall of the sacrificial fires--the Sacrificer by the eastern, the wives by the southern, door.