Śatapatha Brāhmaṇa ("of a hundred paths") 10.5.2.9

10.5.2.9

tadeṣa śloko bhavati antaram mṛtyoramṛtamityavaraṃ hyetanmṛtyoramṛtam mṛtyāvamṛtamāhitamityetasminhi puruṣa etanmaṇḍalam pratiṣṭhitaṃ tapati mṛtyurvivasvantaṃ vasta ityasau vā ādityo vivasvāneṣa hyahorātre vivaste tameṣa vaste sarvato hyenena parivṛto mṛtyorātmā vivasvatītyetasminhi maṇḍala etasya puruṣasyātmaitadeṣa śloko bhavati

Now, that person in the right eye is the same as Indra, and (that other person is) the same as Indrânî: it is for the sake of these two that the gods made that partition (between the eyes), the nose; whence he (the husband) should not eat food in the presence of his wife; for from him (who does not do so) a vigorous son is born, and she in whose presence (the husband) does not eat food bears a vigorous (son):--