Leviticus 14:37 Halakhah

וְרָאָ֣ה אֶת־הַנֶּ֗גַע וְהִנֵּ֤ה הַנֶּ֙גַע֙ בְּקִירֹ֣ת הַבַּ֔יִת שְׁקַֽעֲרוּרֹת֙ יְרַקְרַקֹּ֔ת א֖וֹ אֲדַמְדַּמֹּ֑ת וּמַרְאֵיהֶ֥ן שָׁפָ֖ל מִן־הַקִּֽיר׃

And he shall look on the plague, and, behold, if the plague be in the walls of the house with hollow streaks, greenish or reddish, and the appearance thereof be lower than the wall;