Reference for Shabbat 4:2

מראות נגעים שנים שהן ד'

the appearances of leprosy are two, which are four;<span class="x" onmousemove="('comment',' The two are 'a rising' and 'a bright spot' (Lev. XIII, 2), which, in order to be unclean, must be snowy white and white as wool respectively. To these the Rabbis added, by exegesis, the whiteness of the plaster of the Temple and the whiteness of the white of an egg respectively-in each case a darker shade. ');">²</span>

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