Śatapatha Brāhmaṇa ("of a hundred paths") 5.2.1.10

5.2.1.10

sa rokṣyanjāyāmāmantrayate | jāya ehi svo rohāveti rohāvetyāha jāyā tadyajjāyāmāmantrayate 'rdho ha vā eṣa ātmano yajjāyā tasmādyāvajjāyāṃ na vindate naiva tāvatprajāyate 'sarvo hi tāvadbhavatyatha yadaiva jāyāṃ vindate 'tha prajāyate tarhi hi sarvo bhavati sarva etāṃ gatiṃ gacānīti tasmājjāyāmāmantrayate

Being about to ascend, he (the Sacrificer) addresses his wife, 'Come, wife, ascend we the sky!'--'Ascend we!' says the wife. Now as to why he addresses his wife: she, the wife, in sooth is one half of his own self; hence, as long as he does not obtain her, so long he is not regenerated, for so long he is incomplete. But as soon as he obtains her he is regenerated, for then he is complete. 'Complete I want to go to that supreme goal,' thus (he thinks) and therefore he addresses his wife.