Commentary for Bekhorot 110:25

(שמות כב, כח) בכור בניך תתן לי כן תעשה לשורך לצאנך

except the river Euphrates<span class="x" onmousemove="('comment',' Because there is then a decrease in the rain water and also because the Euphrates is constantly welling up with fresh waters. Consequently, we see that he holds that rivers grow from rain water, unlike the opinion expressed above. Another explanation is (Rashi) : Samuel's father specially made a mikweh for his daughters because it was the end of the winter and after the great rains but not in the middle of winter, whereas here Samuel says that we always require a mikweh except when bathing in the Euphrates in the days of Tishri. For further notes v. Ned., Sonc. ed., p. 129.');">¹⁵</span> in the days of Tishri. <big><b>MISHNAH: </b></big>AN ANIMAL BOUGHT OR GIVEN AS A PRESENT IS EXEMPT FROM THE LAW OF CATTLE TITHE. <big><b>GEMARA: </b></big>Whence is this proved? - Said R'Kahana: Because Scripture says: The first-born of thy sons thou shalt give unto Me. Likewise thou shalt do with thine oxen and with thy sheep;<span class="x" onmousemove="('comment',' Ex. XXII, 28, 29.');">¹⁶</span>

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