The Gospel of Thomas
14. (b)When you go into any region and walk about in the countryside, when people take you in, eat what they serve you and heal the sick among them.
The Nag Hammadi Library,The Gospel of Thomas,Translated by Stephen Patterson and Marvin Meyer,These are the secret sayings that the living Jesus spoke and Didymos Judas Thomas recorded. And he said, "Whoever discovers the interpretation of these sayings will not taste death."