The Compendium of Caraka 1.3.6

1.3.6

ityardharūpairvihitāḥ ṣaḍete gopittapītāḥ punareva piṣṭāḥ/
siddhāḥ paraṃ sarṣapatailayuktāścūrṇapradehā bhiṣajā prayojyāḥ//

These [six groups of drugs] arranged in half-verses, soaked in ox bile and then ground again,
prepared excellently and combined with mustard oil, should be used by the physician as powdered pastes.