Chāndogya Upaniṣad 5.2.4

5.2.4

atha yadi mahaj jigamiṣet , amāvāsyāyām dīkṣitvā paurṇamāsyāṃ rātrau sarvauṣadhasya mantham dadhimadhunor upamathya jyeṣṭhāya śreṣṭhāya svāhety agnāv ājyasya hutvā manthe saṃpātam avanayet \\502.4\

4. Now, if one should wish to come to something great, let him on the night of a new moon perform the Preparatory Consecration Ceremony (Dīkshā), and on the night of the full moon mix a mixed potion of all sorts of herbs with sour milk and honey.

‘Hail to the chiefest and best!’—with these words he should offer a libation of melted butter in the fire and pour the residue into the potion.