Eruvin 1:7 - 1:8

ורבי יוסי פוסל – for we suspect lest it die, and it would not be ten [handbreadths] high, and doesn’t give his attention and relies upon it.

ומטמא משום גולל – if they made it a stone placed on top of a burial cave it defiles forever and if a person or utensils came in physical contact with it, it is like the tent of the dead, even if he was removed from there, as it is written (Numbers 19:16): “And in the open, anyone who touches a person [who was killed or who died naturally, or human bone, or a grave, shall be unclean seven days].” But the Rabbis expound upon it to include the stone placed on top of the burial cave and the frame supporting the movable stone of a tomb. The "גולל"/the stone placed on top of a burial cave is the covering of the grave.

ור"מ מטהר – the reason of Rabbi Meir is because he holds that any partition made of something living is not a partition, and it is not the Halakha.

ור"י הגלילי פוסל – as it is written (Deuteronomy 24:1): “”and he writes her a bill [of divorcement, hands it to her, and sends her away from his house].” Just as a scroll lacks a living spirit/life, so too, anything that does not have a living spirit/life. And the Rabbis: If it (i.e., the Torah) had written “and he writes her in a bill,” it would be as you said, but now that it is written [in the Torah]: “and he writes her a bill” – it comes to count things, but the Halakha is according to the First Tanna/teacher, [and if he wrote] her a bill of divorce on the horn of the heifer, and he gave her the heifer, for now it does not require cutting after it had been written, it is valid. But, if he did not give her the heifer, but rather the horn, since it requires cutting, one does not divorce by it.

ולא יהיה פרצות יתרות על הבנין – and even if they are small breaches/gaps, less than ten [handbreadths], if the breach/gap is greater than the standing part, it is not a partition, and even if it corresponds to the standing part, it is prohibited.

כל פרצה שהיא בעשר אמות מותרת – as long as the standing part greater than it; alternatively, what is breached is like the standing part, it is a partition and even corresponding to the breach/gap, it is permitted.

יתר מכאן אסור – even one breach/gap that is greater than ten [cubits] prohibits the entire circumference, and even if the standing part is greater than it, for people don’t make openings greater than ten [cubits] and it would be a breach, and especially if it lacks the form of an opening, but if it has the form of an opening, even greater than ten [cubits], it is an opening.