Keilim 20:4 - 20:5

עד שיקצע (until he smooths/cuts off/trims the rough parts) – that he would cut it off and establish it for sitting. And the Halakha is according to the Sages.

אע"פ שקבעה בכותל טמאה – through defilement through a corpse or a reptile. But it is not annulled from being a vessel, and we don’t say a vessel that is attached to the ground is like the ground itself, but rather only when it was attached/connected to the ground at its outset, or that it was made in order to serve the ground.

כופת (a stool/a block with a concave top to sit upon) – a vessel designated for sitting. And it is of date-palm.

שקבעו בנדבך (that was fixed into a course of the wall, course of bricks/stones) – in the row of the building.

בנה עליו ולא קבעו (built upon it but did not fix it) – in the manner that the artisans do when building an arch/doorway over the boards and afterwards sawing them.

טמא – if he person with gonorrhea sat on the building that he is upon, the stool/block with a concave top to sit on that is under the building is defiled. For the person with gonorrhea defiles that which he sits upon and that which he lies upon that is under the stone used for closing a pit (which may be over a corpse). And similarly, they fixed it but did not build upon it and the person with gonorrhea sat upon it when it is fixed, it is ritually impure, but it is not nullified in this. But when he fixed it and built upon it, it is nullified in regard to the wall, and it is like a wall.

מפץ (a mat of reeds, bark, the poor man’s mattress) – like the species of matting made from reeds or from bulrushes/reed-grass.

על גבי הקורות – of the attic.

מעזיבה (a concrete of stone chippings, clay) – plaster and pebbles of stones that one places on the room. And all the while that one did not fix the mat of reeds in the walls and the person with gonorrhea sat on the concrete of stone chippings, the mat is defiled that is below it, but it is not annulled from the laws of a vessels, for if he wanted, he could take it. And similarly, if he fixed it but did not place upon it the concrete of stones and the person with gonorrhea sat upon it, it is impure from sitting. But it is not annulled until he fixes it and places the concrete of stone chippings upon it.

כדרך קבלתה – its rims below.

כדרך שלא קבלתה – its rims above.