Talmud zu Pirkei Avot 1:13

A similar case: When does a man acquire Sabbatical fruit? Rebbi Jeremiah wanted to say, when he puts them in his vessels. Rebbi Yose wanted to say, even if he puts them into his vessels he did not acquire them; he thinks that they are his but they are not his⁴³If the fruits had a human owner, they would become property of the person who takes them. If somebody steals fruit from a farmer, once the fruit is in his vessel he is the owner but owes the farmer the value of the fruit he took. However, Sabbatical fruit are God’s property; even after they have been harvested they retain the holiness of the Sabbatical. They may be eaten but not used for industrial purposes. Hence, they cannnot be acquired as property.. Compare the following⁴⁴Different versions of the story are in Massekhet Kallah; BabliNedarim 62a.: Rebbi Tarphon went to eat single figs from somebody’s property without reciprocity, following the House of Shammai. The watchmen⁴⁵Jastrow takes the word as saf‘el of נטר “to guard”. (In Arabic, the word means “cymbal”.) saw him and started whipping him. When he saw himself in danger, he said to them, by your lives, tell in Tarphon’s house to have his burial shrouds ready. When they heard this, they prostrated themselves before him and said, Rebbi, forgive us. He said to them, so and so should come upon me if I did not forgive you beforehand every stick that was coming down on me. In these two instances did Rebbi Tarphon follow the House of Shammai and endangered himself, in the case here and in the recitation of Shema'⁴⁶Berakhot, Mishnah 1:7.. Rebbi Abbahu in the name of Rebbi Ḥanina ben Gamliel: All his life did Rebbi Tarphon repent about this happening and said, woe to me that I used the Crown of the Torah⁴⁷MishnahAvot 1:13: “He who uses the Crown disappears.”.

He also used teach four things in the Babylonian tongue: One who pursues a name, loses his name; One who does not serve the sages, deserves death; One who does not increase, loses; and One who makes use of the crown, perishes, and then it is lost to him.
One who pursues a name, loses his name. How so? This teaches us that a person should not seek to be known in the state, for eventually they will begin to take note of him, and then kill him and take his money.
He who does not serve the sages, deserves death. How so? (They tell) There is a story about a person from Beit Ramah who conducted himself with great piety. Rabban Yohanan ben Zakkai sent one of his students to go check up on him. The student went, and found him putting oil on a stovetop, and then taking it off and putting it on beans. The student said to him: What are you doing? He replied: I am a high priest, and I am eating the priestly tithe in a state of [ritual] purity. The student said: But is that stovetop impure or pure? He said: Does it say anywhere in the Torah that a stovetop can be impure? The Torah speaks only of an oven becoming impure, as it says (Leviticus 11:33), “Everything in it becomes impure.” The student replied: Just as the Torah speaks of an oven becoming impure, so it speaks also of a stovetop becoming impure, as it also says (Leviticus 11:35), “An oven and a stovetop must be smashed; they are impure.” And if that is so, you have never eaten the priestly tithe in a state of purity in your entire life!
He who does not add, loses. How so? This teaches us that if a person learns only one tractate – or even two, or three – but does not keep adding to them, in the end he will forget even those he did learn.
He who uses it as a crown, perishes, and then it is lost to him. How so? For anyone who uses the Ineffable Name of God has no share in the World to Come.