Skandapurana 6.3.19.49

6.3.19.49

jajñe'tha tasyeśvarayogamūrteḥ pradhyāyamānasya surendrasaṅghaḥ .
vedāśca yajñāśca tathaiva varṇāstathā hi sarvauṣadhayo rasāśca .. 19.49 ..

Then, as that [Lord] whose form is the yoga of Īśvara meditated, the host of the chiefs of the gods was born, / as well as the Vedas, sacrifices, and likewise the castes, and indeed all medicinal herbs and juices.