Reference for Zevachim 16:4

(של"ו קבאיצ"ן ממה"ר בצ"א ב"א סימן)

Our Rabbis taught: The Passover-offering, in its season,<span class="x" onmousemove="('comment',' The time for killing it is from midday on the fourteenth of Nisan until nightfall.');">³</span>

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