Quoting%20commentary for Bekhorot 52:50

בכור בניך תתן לי כן תעשה לצאנך

What is the reason? - Said R'Shesheth: Because it makes him appear like a priest who helps in the threshing floors.<span class="x" onmousemove="('comment',' For in our days a firstling is of no use until a blemish befalls it. As, therefore, the Israelite has to take trouble with the animal for fifty days, i the priest asks him to deliver the firstling to him during this period to look after, he thus saves the Israelite expense and labour, in consideration for which he takes possession of the firstling and thereby prevents any other priest claiming it. He thus seems to be on a par with a priest who helps with the threshing in order that he may receive the priestly dues for his services, which is forbidden. If, however, the firstling was blemished and the priest asked him for it so that he might eat it, this would be permissible.');">²⁶</span>

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