כִּ֤י תָבֹ֙אוּ֙ אֶל־אֶ֣רֶץ כְּנַ֔עַן אֲשֶׁ֥ר אֲנִ֛י נֹתֵ֥ן לָכֶ֖ם לַאֲחֻזָּ֑ה וְנָתַתִּי֙ נֶ֣גַע צָרַ֔עַת בְּבֵ֖ית אֶ֥רֶץ אֲחֻזַּתְכֶֽם׃
"Quand vous serez arrivés au pays de Canaan, dont je vous donne la possession, et que je ferai naître une altération lépreuse dans une maison du pays que vous posséderez,
Mishnah Negaim
All houses may contract negaim uncleanness, except those of non-Jews. If one bought houses from non-Jews, any it must be inspected as if they had then first appeared. A round house, a triangular house, or a house built on a ship, on a raft or on four beams, is not susceptible to negaim uncleanness. But if it was four-sided, even if it was built on four pillars, it is susceptible to uncleanness.