Keilim 24:7-8

Keilim 24:7

There are three kinds of tablet (for writing): a folding chair (used as a tablet when folded) is susceptible to midras impurity, a tablet that has a receptacle for wax is susceptible to corpse impurity and a smooth surface is insusceptible to all types of impurity.

Keilim 24:8

There are three kinds of bed: one that is designed to lie on is susceptible to midras impurity, the bed used by glass makers is susceptible to corpse impurity and the one used by net weavers is insusceptible to all types of impurity.