Midrasch zu Mischlej 11:17

Samuel said: "A man who fasteth is called a sinner"; for it is said (Num. 6, 11) And he shall make atonement for him, for that he sinned with his soul. Wherein did he sin with his soul? We must say that it refers to the sin of having abstained from wine. He holds the same opinion as we are taught in a Baraitha of the Tana, R. Elazar Hakapar the Great, who says: "Is this not an a fortiori reasoning? If one abstains from drinking wine he is called a sinner; how much more should one be called a sinner if he abstains from everything (i.e., fasts)." R. Elazar, however, says: "On the contrary, he is called holy; as it is said (Ib. 5) He shall be holy, he shall let the locks of the hair of his head grow long. Is this not proved a fortiori? If one who simply obstains from wine is termed holy, how much more so should one who abstains from everything (i.e., fasts) be termed holy?" But how will Samuel explain the passage that calls such a man holy? This refers only to one who lets his hair grow. But how will R. Elazar explain the passage that calls such a man a sinner? This applies only to one who defiles himself. Did R. Elazar indeed say that fasting is a sin? Behold, R. Elazar said: "A man shall always think of himself (Ib. b.) as if sanctity rests within his entrails; for it is said (Hos. 11, 9) The Holy One is within thee." This is not difficult to explain. The latter refers to a case where one can endure the pains of abstinence, but the former refers to a case where he could not endure suffering. Resh Lakish said: "Such a man [who does not fast] is to be termed Chasid (pious); as it is said (Pr. 11, 17) He who takes care of his soul is a pious man." R. Jeremiah b. Abba said in the name of Resh Lakish: "It is not lawful for a scholar to fast, because through [wickedness of] fasting he diminishes Heavenly work." R. Shesheth said: "If a young scholar sitteth and fasteth, a dog may even eat his meal." [for he remains without health to study the Torah]

Another Thing: 'But if he is impoverished', here it is written, "The merciful man does good to his own soul (Proverbs 11:17)," this [refers to] Hillel the Elder, who, at the time that he was departing from his students, would walk with them. They said to him, "Rabbi, where are you walking to?" He said to them, "To fulfill a commandment!" They said to him, "And what commandment is this?" He said to them, "To bathe in the bathhouse." They said to him: "But is this really a commandment?" He said to them: "Yes. Just like regarding the statues (lit. icons) of kings, that are set up in the theaters and the circuses, the one who is appointed over them bathes them and scrubs them, and they give him sustenance, and furthermore, he attains status with the leaders of the kingdom; I, who was created in the [Divine] Image and Form, as it is written, "For in the Image of G-d He made Man (Genesis 9:6)," even more so!...