Reference for Chullin 175:17
מכאן אמרו
R'Simeon B'Gamaliel said: This is so only if he did not cover up the life blood, but if he covered up the life blood, th need not be covered.
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Talmud Bavli
מכאן אמרו
R'Simeon B'Gamaliel said: This is so only if he did not cover up the life blood, but if he covered up the life blood, th need not be covered.