CHĀNDOGYA UPANISHAD · 5.2.4

अथ यदि महज् जिगमिषेत्, अमावास्यायाम् दीक्षित्वा पौर्णमास्यां रात्रौ सर्वौषधस्य मन्थम् दधिमधुनोर् उपमथ्य ज्येष्ठाय श्रेष्ठाय स्वाहेत्य् अग्नाव् आज्यस्य हुत्वा मन्थे संपातम् अवनयेत् ॥

atha yadi mahaj jigamiṣet, amāvāsyāyām dīkṣitvā paurṇamāsyāṃ rātrau sarvauṣadhasya mantham dadhimadhunor upamathya jyeṣṭhāya śreṣṭhāya svāhety agnāv ājyasya hutvā manthe saṃpātam avanayet ॥

If a man wishes to reach greatness, let him perform the Dîkshâ (preparatory rite) on the day of the new moon, and then, on the night of the full moon, let him stir a mash of all kinds of herbs with curds and honey, and let him pour ghee on the fire (âvasathya laukika), saying; 'Svâhâ to the oldest and the best.' After that let him throw all that remains (of the ghee) into the mash.

F. Max Müller · The Upanishads, Sacred Books of the East 1 (1879)