Reference for Keritot 33:3

אלא לרבא דאמר

It is true that that which taught, 'he is liable', may be met either by the case where the letters were written with knowledge of the Sabbath but in ignorance of their prohibition, when it is held that the Sabbaths are considered as one object,<span class="x" onmousemove="('comment',' For R. Akiba did not accept R. Eliezer's ruling.');">²</span>

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