Śatapatha Brāhmaṇa ("of a hundred paths") 11.5.9.2

11.5.9.2

atha mano ha vā aṃśuḥ vāgadābhyaḥ prāṇa evāṃśurudāno'dābhyaścakṣurevāṃśuḥ śrotramadābhyastadyadetau grahau gṛhṇanti sarvatvāyaiva kṛtsnatāyai

And, indeed, the Amsu is also the mind, and the Adâbhya speech; and the Amsu is the out-breathing, and the Adâbhya the up-breathing; and the Amsu is the eye, and the Adâbhya the ear: these two cups they draw for the sake of wholeness and completeness.