Bṛhadāraṇyaka Upaniṣad ("Great Forest Teaching") 2.4.11

2.4.11

sa yathāsarvāsāmapām̐ samudra ekāyanamevam̐ sarveṣām̐ sparśānāṃ tvagekāyanamevam̐ sarveṣāṃ gandhānāṃ nāsike ekāyanamevam̐ sarveṣām̐ rasānāṃ jihvaikāyanamevam̐ sarveṣām̐ rūpāṇāṃ cakṣurekāyanamevam̐ sarveṣām̐ śabdānām̐ śrotramekāyanamevam̐ sarveṣām̐ saṃkalpānāṃ mana ekāyanamevam̐ sarvāsāṃ vidyānām̐ hṛdayamekāyanamevam̐ sarveṣāṃ karmaṇām̐ hastāvekāyanamevam̐ sarveṣāmānandānāmupastha ekāyanamevam̐ sarveṣāṃ visargāṇāṃ pāyurekāyanamevam̐ sarveṣāmadhvanāṃ pādāvekāyanamevam̐ sarveṣāṃ vedānāṃvāgekāyanam

'As all waters find their centre in the sea, all touches in the skin, all tastes in the tongue, all smells in the nose, all colours in the eye, all sounds in the ear, all percepts in the mind, all knowledge in the heart, all actions in the hands, all movements in the feet, and all the Vedas in speech,--