Holy Unmercenaries (Greek: Άγιοι Ανάργυροι) literally the "ones without silver or money" is an epithet applied to a number of Christian saints who did not accept payment for good deeds of compassion and care for the sick and destitute.
Wisdom of Sirach 38:1-15
Honor a physician with the honor due unto him for the uses which ye may have of him: for the Lord hath created him. For of the most High cometh healing, and he shall receive honor of the king. The skill of the physician shall lift up his head: and in the sight of great men he shall be in admiration.
The Lord hath created medicines out of the earth; and he that is wise will not abhor them.
Was not the water made sweet with wood, that the virtue thereof might be known? And he hath given men skill, that he might be honored in his marvelous works. With such doth he heal men, and taketh away their pains. Of such doth the apothecary make a confection; and of his works there is no end; and from him is peace over all the earth, My son, in thy sickness be not negligent: but pray unto the Lord, and he will make thee whole. Leave off from sin, and order thine hands aright, and cleanse thy heart from all wickedness. Give a sweet savor, and a memorial of fine flour; and make a fat offering, as not being.
Then give place to the physician, for the Lord hath created him: let him not go from thee, for thou hast need of him.