Reference for Leviticus 14:38

וְיָצָ֧א הַכֹּהֵ֛ן מִן־הַבַּ֖יִת אֶל־פֶּ֣תַח הַבָּ֑יִת וְהִסְגִּ֥יר אֶת־הַבַּ֖יִת שִׁבְעַ֥ת יָמִֽים׃

then the priest shall go out of the house to the door of the house, and shut up the house seven days.

BDB