Zavim 4:4-5

Zavim 4:4

Let’s say that a zav lies across five benches or five money belts. If he did so along their length, they are rendered unclean; if across their width, they remain clean. If he slept on them (widthwise) and there’s a doubt as to whether he turned on them (lengthwise), they are rendered unclean. If he was lying on six chairs, with his hands on two, his feet on two more, his head on one and his body on another one, then only the one under his body is rendered unclean. If he stood on two chairs, Rabbi Shimon says that if they were distant from one another, then they remain clean.

Zavim 4:5

If there were ten cloaks one on top of the next and he sat on the topmost cloak, all of them are rendered unclean. Let’s say that the zav was on one pan of a scale and in the other pan there were items suitable to sit or lie upon. If the zav weighed down the scale, the objects remain clean; if the objects weighed down the scale, they are rendered unclean (since the zav is being supported by them). Rabbi Shimon says that if there was one object it is rendered unclean but if there were multiple such objects, they remain clean because none of them supported the greater part of the zav.