Talmud sur Kéilim 1:1

Anywhere one stated categories there are derivatives. There, we have stated²¹⁸Mishnah Bava qamma 1:1.: “There are four categories of damages. The ox”, this is the horn. Goring and pushing are main categories. Rebbi Ḥiyya stated: If it bit, lay down, kicked, these are derivatives of the horn. There, we have stated²¹⁹Mishnah Kelim 1:1.: “The categories of impurity, the crawling animal and semen.” What are derivatives of crawling animals? Rebbi Jehudah in the name of Rebbi Naḥum: pushings. What are pushings? Touching²²⁰Both in Šabbat and Bava qamma categories are labels of sets of derivatives. But in Kelim, treating of impurity, derivative impurity is less infectuous than original impurity, and there are successive states of derivative impurity. The nature of אָב in impurity really is not comparable to the nature of אָב in the other two cases.. The main category of impurity makes everything impure, derivative impurity transmits impurity only to food and drink, or clay vessels²²¹This is not an exhaustive list and does not take into account that different implements may be subject to impurities in different degrees depending on the kind of original impurity in question. In general, metal vessels may become impure by touch from derivative impurities but not clay vessels (Mishnah Zavim 5:1); all food and drinks may become impure by derivative impurities of the first degree. Babli Bava qamma 2b.. Food and drink and [clay]²²²Missing in the text but indicated by the construct state of the word כֶּלִי. vessels cannot become main categories of impurity to transmit impurity²²³This statement requires that מַשְׁקִין be translated as “drinks”. The same word may also mean “fluids”, but human body fluids may be sources of original impurity and the water used for the ashes of the Red Cow may become the source of original impurity.. Gonorrhea. And here, we have stated: “The categories of work are 39.” Ploughing is a category. Rebbi Ḥiyya stated: If one dug a hole, made a ditch, or dug to put in a pole, these are derivatives of ploughing²¹⁶The activities quoted here are all derivatives of ploughing (Babli 73b)..