Reference for Keritot 33:14

אלא אי אמרת רבן גמליאל כר' אליעזר ס"ל מכלל דפליגי במאי

If is in [the case where the letters were written] in ignorance of the Sabbath but with knowledge of their prohibition; but [in that case] even R'Eliezer agrees with Rabban Gamaliel that awareness is of no consequence with regard to half-sizes, as has been taught: 'If one wrote two letters on two Sabbaths, one letter on the one Sabbath and the other on the other Sabbath, R'Eliezer holds he is liable'.<span class="x" onmousemove="('comment',' R. Eliezer conforms thus to Rabban Gamaliel's view in the second Baraitha.');">¹⁰</span>

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