Beitzah 25B

אורח ארעא קא משמע לן.

merely teaches us proper etiquette, even though no prohibition is involved.

כדתניא: לא יאכל אדם שום ובצל מראשו, אלא מעליו. ואם אכל ⁠— הרי זה רעבתן. כיוצא בו: לא ישתה אדם כוסו בבת אחת, ואם שתה ⁠— הרי זה גרגרן. תנו רבנן: השותה כוסו בבת אחת ⁠— הרי זה גרגרן, שנים ⁠— דרך ארץ, שלשה ⁠— מגסי הרוח.

§ The rabbis teach proper manners unconnected to any prohibition, as it is taught in a baraita: A person should not eat garlic or onions from the side of its head, i.e., its roots, but rather from the side of its leaves. And if he did eat in that manner, he gives the appearance of being a glutton. Similarly, a person should not drink his cup of wine all at once, and if he did drink in this manner, he gives the appearance of being a greedy drinker. A baraita states in this regard: One who drinks his cup all at once is a greedy drinker; if he does so in two swallows, this is proper etiquette; in 3 swallows, he is of haughty spirit, as he presents himself as overly delicate and refined.

ואמר רמי בר אבא: חצובא ⁠— מקטע רגליהון דרשיעיא.

Apropos the previous discussion, the Talmud notes that Rami bar Abba also said: The sea squill, a plant from the lily family whose roots project deep into the ground, will cut off the feet of the wicked in the future on the Day of Judgment. It was customary to plant sea squill on the edges of fields as boundary markers because their roots grow straight down without spreading out. Those who overstepped boundaries and infringed upon their neighbor’s property should have heeded the markers and desisted.

נטיעה ⁠— מקטע רגליהון דקצביא ודבועלי נדות.

Similarly, young trees will cut off the feet of butchers and those who have sex with menstruating women. After a tree is planted, one must wait 3 years before eating its fruit. This should serve as a lesson for those butchers who hasten to eat of the animal’s meat before removing its hide, and for those who have sex with their menstruating wives and do not wait for them to achieve ritual purification.