Bava Basra 1:1 - 1:2

השותפין שרצו לעשות מחיצה – we are speaking of a courtyard where there is no law of division in it, where there lacks by the way four cubits for each one of the partners. For this reason, it (i.e., the Mishnah) taught " "שרצו/that they wanted, which implies that especially, two of them want [to make a partition] but neither one of them is able to force his fellow, for if in a courtyard which has a law of division, each one of them is able to force his fellow to divide, but now, it comes to teach us that since they wanted to divide it, and each one of them had taken possession of the direction that is entitled for him according to what they had compromised, they build the wall in the middle, and this one gives from his portion one-half of the place the thickness of the wall and also this one.

גויל – stones which are not trimmed or fixed.

גזית – stones which are trimmed and planed with a saw.

כפיסין – a small brick/girder which is a one-half brick which is a handbreadth-and-a-half (i.e., one handbreadth equals 3.65 inches or 9.34 cm) and a brick is three handbreadths.

הכל כמנהג המדינה – "הכל"/everything includes a place where they have the practice to make a partition with the sprouts of vine and the branches of trees that they make according to the custom, as long as the partition is wide enough so that neither one of them cis able to see that of his fellow for visual damage is called damage, and the height of the wall and the partition is not less than four cubits.

זה נותן שלשה טפחים – that the wall of untrimmed stones requires an additional handbreadth more than the wall of hewn stones because of the tops of the stones that protrude outward which are not smooth.

ובכפסים זה נותן טפחי – that the thickness of the wall of the one-half/small/girder brick is a handbreadth greater than the width of a wall of full brings because he places a small brick/bond-timber on one side and a small brick/bond-timber on the other side, which are three handbreadths and a handbreadth in the middle in which they place there plaster to attach them, but the wall made from bricks, one places a full brick along the thickness of the wall which is three handbreadths and there is no need for plaster in the middle.

המקום והאבנים של שניהם – this tells us that even though the stones fell into the domain of one them, or alternatively, that one of them first removed them into his domain, you might have thought that it belongs to the other – for the claimant must produce the evidence. But this comes to tell us that this is not the case.

וכן בגנה – this is what he said, "וכן בגנה"/and likewise in the case of a garden, undefined, as a place where it was they had the custom to fence it in.

אבל בבקעה – undefined, it is like a place where they had the custom to not fence it in, and we don’t require it, other than if his fellow wanted to fence it in, he moves it back to his own part

ועושה לו חזית – a sign for recognition that the wall is his. And the sign is explained in the Gemara (Talmud Bava Batra 4b): he spreads the top of the wall a cubit with plaster to the side of his fellow, but not to his side lest his fellow all spread from his side. And he says that the wall belongs to both. But when he spreads to the side of his fellow, he doesn’t plaster on to his side. It is a sign that the wall is his, but if his fellow peels/scrapes It off, it is known as peeled.

ועושין חזית מכאן ומכאן – to announce that both of them made it.