Peah 2:2 - 2:3

אמת המים שאינה יכולה להקצר כאחת – which was so wide that until one stands in the middle [of the channel] , he is unable to reap from one side or the other.

ר' יהודה אומר מפסקת – And he disagrees with the First Tanna, that he said above regarding the pool, that is the canal that in every manner it forms a division; but Rabbi Yehuda holds that if he is able to reap as one, it does not divide. And the Halakha is according to Rabbi Yehuda.

וכל ההרים אשר במעדר יעדרון – A mountain whose thin-point is upright and cattle with its utensils are unable to to pass there, and there is a division between the two fields.

הוא נותן פאה לכל – that is to say, he gives provides one “Peah”/corner for the two fields and it is not considered a division, for since they are hoed with a mattock, that is to say, that people dig the mountain with the utensil that they dig up the ground, this is not a division. For the person who sees it says that this not uncultivated ground, but the next day, they hoe it with a mattock and seed it and the two fields which are as one.

הכל מפסיק לזרעים – It is explains in the Gemara of the Jerusalem Talmud (Peah 17a) that the word הכל/all of these – includes a rock hat would pass over the face of the entire field. If it is necessary to uproot the plough from this side in order to place it on that side, one makes a division.

אלא גדר – ten handbreadths high.

שער כותש – the branches of a tree are called שער. And the explanation is a thick hair crown, i.e., ramifications forming a sort of arbor – that the boughs of the trees combine one with the other above from the fence like these leaves that are caught in the mortar-shaped cavity. [The Gemara asks: Does this mean, like the pestle in the mortar (i.e., the partition is formed by a depression in the ground between the two fields, out of which the fence rises), or does it mean, pressing up (overgrowing) the fence? The ‘hair (ramification) presses, and not the ‘fence presence’, it is evident that it means overgrowing the fence.’].