Anandakanda 2.8.37

2.8.37

nirmalaṃ kathitaṃ svacchaṃ guru syād gurudāyutam /
snigdhaṃ rūkṣaṃ vinirmuktam arajaskam areṇukam //

It is declared to be spotless, clear, heavy—endowed with weight— / oily, free from roughness, devoid of dust, and free of grit;