Shiva Purana
संसारवैद्यः सर्वज्ञः सर्वभेषजभेषजम् । आदावारोग्यदं वारं स्ववारं कृतवान्प्रभुः १३ ।
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