Halakhah for Eruvin 46:4
מנא הני מילי
the Torah<span class="x" onmousemove="('comment',' By the addition of the apparently superfluous 'by fifty' (cf. prev. note) to the dimensions of a hundred by fifty.');"><sup>6</sup></span> having thus ordained, 'Take away fifty<span class="x" onmousemove="('comment',' The excess of the length (hundred cubits) over the breadth (fifty cubits) , thus leaving a square area of fifty by fifty cubits.');"><sup>7</sup></span>
Sefer HaChinukh
And since we explained the shekel-coins, it is fitting that we explain how much is a chomer: You should know that the chomer is a measure that is [also] called a kor. And a kor is two letech, and a letech is fifteen seah. It comes out that a chomer is thirty seah, which is ten eipah - as an eipah is three seah. It is a well-known thing and we also already knew it from our Rabbis, may their memory be blessed, (Eruvin 23b) that a place that has fifty ells by fifty ells is a beit seah - meaning that it is [what contains what grows from] a seah of barley - and that is two thousand five hundred [square ells] by arithmetic (multiplication). It comes out that a place that is fitting for the seed of a chomer of barley - which is thirty seah - is seventy-five thousand ells by arithmetic.
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