Aṣṭāṅgahṛdayasaṃhitā

tatra dravyasya rasādibhyaḥ prāṅnirdeśaḥ, prādhānyāt||1||
dravyameva rasādīnāṃ śreṣṭhaṃ, te hi tadāśrayāḥ||1||