Chasidut for Pesachim 191:12
אלא ההוא הזה למעוטי פסח שני דכוותיה
while elsewhere it is said, And ye shall keep it [mishmereth] until the fourteenth [etc.]:<span class="x" onmousemove="('comment',' Tishmeru and mishmereth have the same root.');"><sup>17</sup></span> just as there it requires a four days' examination before slaughtering, so here too it requires a four days examination before slaughtering? - There it is different, because tishmeru ['ye shall observe'] is written.<span class="x" onmousemove="('comment',' Hence the animal must be examined daily for four days before it is sacrificed, and the same applies to the annual Passover-offering, though the latter is not actually declared to be taken for that purpose.');"><sup>18</sup></span>
Kedushat Levi
Exodus 9,3. “and to the Children of Israel say as follows: ‘take a he-goat for a sin offering;” this verse concludes with the words: “as well as an ox and a ram as a peace offering to slaughter in the presence of the Lord and a gift offering soaked in oil, for on this day the Lord has appeared to you” (collectively). This verse which sounds as if it was an afterthought, raises the question how this was possible as we have a rule (Pessachim 96) that any animal designated as a sacrificial animal must undergo at least 4 days of examination to determine if it is not blemished in any way. Why did G’d command to take these animals and present them as sacrifices on the same day they had been selected without their having to undergo the four day period during which they would be examined as to the state of their fitness? The fact that this occurred on the same day is evident from the fact that Aaron did not descend from the altar and bless the people until all the animals and the gift offering had been presented (verse 23).
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