Kauṣītaki Upaniṣad 2.3.9

2.3.9

ity atha dhūmagandhaṃ prajighrāyājyalepenāṅgāny anuvimṛjya vācaṃyamo 'bhipravrajyārthaṃ brūyād dūtaṃ vā prahiṇuyāt /

Then having sniffed the smell of the smoke, having rubbed his limbs over with a smearing of the melted butter, silently he should go forth and declare his object, or despatch a messenger. He obtains indeed.