Reference for Niddah 37:53

(מלכים ב ג:כב) ויראו מואב את המים אדומים כדם

BETH SHAMMAI RULED: ALSO A COLOUR LIKE THAT OF FENUGREEK. But do not Beth Shammai uphold the deduction from, Her blood,<span class="x" onmousemove="('comment',' Dameha, the plural form, Lev. Xli, 7. ');">⁴²</span>

Jastrow