Positive commandment · Mitzvat Aseh #21 of 613
To revere this house
לְיִרְאָה מִבַּיִת זֶה
The verse · Vayikra 19:30
אֶת־שַׁבְּתֹתַי תִּשְׁמֹרוּ וּמִקְדָּשִׁי תִּירָאוּ אֲנִי ה׳
“You shall keep my sabbaths, and reverence my sanctuary: I am the Lord.”
The Rambam’s words
To revere this house, as [Leviticus 19:30] states: "And revere My sanctuary."
לְיִרְאָה מִבַּיִת זֶה, שֶׁנֶּאֱמָר: "וּמִקְדָּשִׁי תִּירָאוּ" (ויקרא יט ל; כו, ב).
Why · Sefer HaChinuch #254
Awe for the Temple
“From the roots of the commandment are what you will see at the end of my words. However, I am afraid of drawing close to the Dwelling of G-d, as I know that “anyone who comes close, who comes close” that has not sufficiently sanctified himself “will not see the House and live.””
Who & when
“And this commandment is practiced [even today] by males and females.”
Where in the Mishneh Torah
Hilchot The Chosen Temple הלכות בית הבחירה