Shiva Purana

siva.sh/siva-purana/vishweshwara-samhita/14/13

संसारवैद्यः सर्वज्ञः सर्वभेषजभेषजम् । आदावारोग्यदं वारं स्ववारं कृतवान्प्रभुः १३ ।

sanskrit

Lord Mahādeva, the global physician, the omniscient, the panacea of all panaceas, made the first day his own day that bestows good health.

english translation

saMsAravaidyaH sarvajJaH sarvabheSajabheSajam | AdAvArogyadaM vAraM svavAraM kRtavAnprabhuH 13 |

hk transliteration by Sanscript