Reference for Niddah 53:28

שליא בבית הבית טמא

'What was mashed once', he replied, 'is not like that which was mashed twice.'<span class="x" onmousemove="('comment',' 'There is no comparison between one presumption that the embryo was mashed and two such suppositions (that the placenta of one embryo and the embryo of another placenta were mashed)'. Jast. ');">²⁴</span>

Jastrow

Jastrow