Mishnayos Keilim Perek 28 Mishnah 6

מטלית (a patch) – which is impure through treading, and one batched it onto a basket. But the basket is not something that can become impure by treading, but when he placed the patch on the basket, the basket was defiled, because it came in contact with the patch that is impure through treading, and this is contact of treading. But the patch, when the patching had been completed, the defilement of treading flew off from it, because it was voided concerning the basket and a basket is not suitable for treading uncleanness.

מטמאה אחד ופוסלת אחד (renders unclean at first remove and renders unfit at one) – like the law of vessels that came in contact with treading uncleanness, and they explained, that it is taught in the Mishnah at the end of [Tractate] Zabim (Chapter 5, Mishnah 6): "הנוגע במשכב מטמא שנים ופוסל אחד"/If a person touched a bed (i.e., the uncleanness caused by an unclean person lying on a object) imparts uncleanness at two removes (at one step and this in turn at another)and renders [heave-offering] unfit at one further remove,” he explained imparting uncleanness at two removes and rendering [heave-offering] unit at one remove, that all the while that the vessel touches the [object] that is unclean through treading, we consider it as a primary source of ritual uncleanness regarding foods to make them first and second degree uncleanness for profane things and third-level of uncleanness for heave offering. But when he separated himself, it is like the offspring of uncleanness (i.e., acquired through contact with any primary source of uncleanness or derivative uncleanness of such) which makes it second-degree of ritual uncleanness for profane things and third-level uncleanness for heave offering alone, which is that it defiles by one degree and invalidates by one degree.

הפרישה (if he removed/separated it) – the patch from the basket, the asked is an offspring of uncleanness, like it was prior to his removing it, but the patch is pure, for since he patched it on the basked, it became like the basket, and it is like a piece of the wall that he took from the basket that the piece is ritually pure. But however, if after its removal from the basket he considered it for sitting, it receives impurity from he onwards if had in it like the measure [for impurity].

טלאה על הבגד (if he patched it on to the cloth) – not that it had been voided from the uncleanness of treading, for he defiles the cloth in two counts and invalidates it in one like the law of vessels that touch uncleanness through treading all the while that he did not remove it.

הפרישה מן הבגד – the law of cloth is like that of vessels that came in contact with [defilement] and then separated/removed it. It defiles at one remove and invalidates at one remove, for the patch, it is like it was, that it had never been voided, and defiles at two removes and invalidates at one.

וכן הטולה (and similarly one who patches) – a patch.

על השק או על העור – like patching on the cloth and it is not voided [and remains unclean].

ר' שמעון מטהר – for he holds that the sack and the hide it is voided, for it is not of its kind. But Rabbi Yossi holds, that with a sack that is woven like it is not voided, but on a hide, since it is not woven, is voided. And the Halakha is according to Rabbi Yossi.