succah 21

the boys whose feet have never touched the ground
and the succah that are too unstable to stand

(strange case of boys who were born in particular courtyards, and never came into direct contact with the ground, lest they become impure by deeply hidden bodies in the ground. they would travel on oxen, refuting the idea that a barrier would have to be man-made, as the ox was a barrier between them and the ground. these boys were used to draw water for use in the red heifer ritual.)