Babylonian Talmud, Taanit 21b

Abba the (expert) bleeder received greetings every day from the heavenly college; Abayi received such a greeting only once every eve of Sabbath; and Rabha would receive such a greeting only once every eve of the Day, of Atonement. Abayi was grieved because of the greater distinction conferred upon Abba, and he was told: "The thing that Abba does, you cannot do." What did Abba do that was so inimitable? First of all, he had a separate place for bleeding men and a separate place for women. Then he had a certain garment for women with which he would clothe them, and which was split so that he could insert the lancet at any place without looking at the woman. Then he had a certain place where his fee for bleeding was deposited, and which was so arranged that as soon as it was touched a ring was heard; but he never looked at the amount deposited, and, those that had not the necessary amount would merely touch the place and depart. If a young scholar came to him to be bled, he would not alone refuse to accept money, but would give him money, saying: "Take this and become well, for after bleeding a good meal should be eaten." [Soncino translation. Edited for clarity and gender neutrality]