Midrash for Bekhorot 54:15
דבי רב תנא
And according to the school of Rabbi, whence do they derive this?<span class="x" onmousemove="('comment',' That the firstling's year is counted from its birth.');"><sup>11</sup></span>
Sifrei Devarim
(Devarim 15:20) "Before the L-rd your G-d shall you eat it, year by year": We are hereby taught that a bechor is eaten for two days — one day in this year, and one day in the next year.
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