Śatapatha Brāhmaṇa ("of a hundred paths") 1.8.3.6

1.8.3.6

tadvā etat | samāna eva karmanvyākriyate tasmādu samānādeva puruṣādattā cādyaśca jāyate idaṃ hi caturthe puruṣe tṛtīye saṃgacāmaha iti videvaṃ dīvyamānā jātyā āsata etasmādu tat

Thus the separation (of the eater and the eaten) is effected in one and the same act; and hence from one and the same man spring both the enjoyer (the husband), and the one to be enjoyed (the wife): for now kinsfolk (gâtyâh) live sporting and rejoicing together, saying, 'In the fourth (or) third man (I.e. generation) we unite.' And this is so in accordance with that (separation of the spoons).