Reference for Pesachim 215:4

דסבר (שמות יב, ו) בין הערבים בין ערב דאתמול לערב דהאידנא

Shall we say that R'Shesheth holds [that] we learned, Close TO the great MINHAH, the reason being on account of the Passover [sacrifice], lest he prolong [the meal] and refrain from performing the Passover [-offering]; and he [also] holds as R'Oshaia, who said: 'The son of Bathyra used to declare valid the Passover [-offering] which one slaughtered in its own name<span class="x" onmousemove="('comment',' i.e., as a Passover, and not as a different sacrifice.');">⁴</span> on the morning of the fourteenth'; and from the morning it is the time for the Passover, for the whole day is the time for the Passover, as he holds, [and the whole assembly.

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