Reference for Niddah 126:22

ואמרת לן עלה אמר רב יהודה אמר שמואל

repeat it a second time and a third time. And when we asked you, 'Since you said, "She need not repeat it a second time" was there any need to state that she need not repeat it a third time'? you replied' She need not repeat it a second time in the case of settled periods [that are determined by the condition] of her body and she need not repeat it a third time in the case of settled periods [determined by the number] of days. But why did he not simply say, 'This is the view of R. Simeon b. Gamaliel'?<span class="x" onmousemove="('comment',' Who holds that presumption cannot be established unless an occurrence was repeated three times (cf. Yeb. 64b). ');">¹⁷</span>

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