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Chandogya Upanishad 5.2.4

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.

In plain words: Someone who wants greatness should begin a preparation rite at new moon. At full moon he mixes herbs with curd and honey, pours ghee (clarified butter) into the fire saying "Svaha to the oldest and best," and adds the leftover ghee to the mixture.

Chandogya Upanishad
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