The Lord in His incarnation of Dhanvantari very quickly cures the diseases of the ever-diseased living entities simply by His fame personified, and only because of Him do the demigods achieve long lives. Thus the Personality of Godhead becomes ever glorified. He also exacted a share from the sacrifices, and it is He only who inaugurated the medical science or the knowledge of medicine in the universe.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
धन्वन्तरिश्च भगवान् स्वयमेव कीर्ति- र्नाम्ना नृणां पुरुरुजां रुज आशु हन्ति । यज्ञे च भागममृतायुरवावरुन्ध- मायुष्च वेदमनुशास्त्यवतीर्य लोके
dhanvantariśca bhagavān svayameva kīrti- rnāmnā nṛṇāṃ pururujāṃ ruja āśu hanti | yajñe ca bhāgamamṛtāyuravāvarundha- māyuṣca vedamanuśāstyavatīrya loke
SB 2.7.21