Mishneh Torah — Positive Mitzvot מצוות עשה, Chapter 21
The full Hebrew text of Mishneh Torah, Positive Mitzvot, Chapter 21, with English translation by Maimonides (Rambam).
לְיִרְאָה מִבַּיִת זֶה, שֶׁנֶּאֱמָר: "וּמִקְדָּשִׁי תִּירָאוּ" (ויקרא יט ל; כו, ב).
To revere this house, as [Leviticus 19:30] states: "And revere My sanctuary."