Lawh-i-Tibb, Tablet to a Physician or Tablet of Medicine is a tablet of Bahá'u'lláh to Áqá Mírzá Muhammad-Ridáy-i-Tabib-i-Yazdí, a doctor of the old school of medicine. It was written in Akká between 1870 and 1875.
In this tablet, Bahá'u'lláh gives advice on eating habits and emotions, and the need for medical treatment. It includes a well-known healing prayer by Bahá'u'lláh:
References
Lawh-i-Tibb Wikipedia(Text) CC BY-SA