Reference for Menachot 84:14

רבי יוחנן בן דהבאי אומר אפילו מראה שני שבה כשר משום שנאמר (ויקרא יד, ד) ושני תולעת

So R'Hanina B'Gamaliel. But R'Johanan B'Dahabai says, Even the second dyeing<span class="x" onmousemove="('comment',' I.e., even though something else has already been dyed with this dye. ,gku, hba ,gku, hba');">²²</span> is valid, for it says, And scarlet.<span class="x" onmousemove="('comment',' Lev. XIV, 4. Heb. is interpreted as 'the second use of the scarlet dye'. And so it is too with the blue dye.');">²³</span>

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