Halakhah su Levitico 19:30

It is a mitzva to act with reverence in a synagogue, for the Torah says: “Revere My  temple” (Vayikra 19:30), and the sanctity of the synagogue is a reflection of the sanctity of the Temple.

(7) And all this, even if not in the house of study. But if one speaks lashon hara and rechiluth in the house of study or in the house of prayer, he also transgresses (Vayikra 19:30): "And My sanctuary shall you fear." (Our house of study is included in the category of the sanctuary, as explained by the poskim.) And we have been commanded by this verse to fear the One who resides there, wherefore we may make there only reckonings of mitzvah, such as [those pertaining to] the tzedakah fund and the like. How much more so is it forbidden to engage there in laughter, joking, and idle converse. And this is a categorical prohibition, as explained in Shulchan Aruch, Orach Chayim 151:11. And even more so is it forbidden to speak there lashon hara or rechiluth, out of fear of the Blessed L–rd who dwells there, aside from the grave issur in itself [of speaking lashon hara]. In speaking thus, one shows himself not to believe that the Holy One Blessed be He reposes His Shechinah in this house — whereby he has the audacity to speak in the house of the King against the will of the King.
And even those who study Torah regularly in the house of study, where they are permitted to eat and drink (as explained in the aforementioned Orach Chaim, section 1), in any event, if they go astray in the issur of laughing and joking or lashon hara and rechiluth in the house of study, they transgress the positive commandment of "My sanctuary shall you fear," aside from the issur itself. As the Magen Avraham wrote (151:2): "Are the Torah scholars not exhorted in respect to fear of the sanctuary? All that was permitted them, perforce, is eating and drinking because they learn in the house of study. If they had to eat and drink outside the house of study, their studies would be interrupted." (As far as converse in general which is not talk of levity for Torah scholars in the house of study, see what we have written with the help of the L–rd in Part Three.)

In contradistinction, the injunction "And you shall reverence My sanctuary" (Lev. 19:30) applies to the entire area of the Temple Mount. The Gemara, Yevamot 6a, and Rambam, Bet haBeḥirah 7:1–10, define this commandment as enjoining reverential behavior and deportment and, accordingly, specifically forbid an individual to enter the Temple Mount while bearing a staff, wearing shoes, carrying a purse, or with dust upon his feet. Noting that efficient performance of their duties requires the guards to be properly shod, Rabbi Rafael permits the wearing of shoes by soldiers on the grounds that failure to patrol the area properly would present an imminent danger.