Keilim 18:5-6

Keilim 18:5

(Midras impurity is conveyed when a zav’s weight – or that of certain others – is borne by an appropriate utensil.) Let’s say that a bed has contracted midras impurity. If a short side with two legs is removed, the bed remains unclean; if a long side with two legs is removed, the bed is rendered clean. Rabbi Nechemya declares the latter unclean as well. If one cuts off two props at diagonally opposite corners, or two legs of a handbreadth each at diagonally opposite corners, or if the bed is reduced to a height of less than a handbreadth from the ground, then it is rendered clean.

Keilim 18:6

Continuing with the case of a bed that has contracted midras impurity, if a long side of it was broken and repaired, it retains the midras impurity. If a second side broke and was repaired, it is purified from its midras impurity but it receives a first-degree level of impurity from having touched something midras. If the second side broke before the first side was repaired, the bed is rendered clean.