Q. I heard something very astonishing. That a Rabbi during a Torah class said that you should not kiss your children after they have been playing vigorously and hard. Could that really be true? Why?
A. The above is likely based on a rule of Shulchan Aruch (Y.D. 116: 4) and Yerushalmi (Terumos 4), that human sweat is deadly poisonous with the exception of the sweat on the face. Taz (ibid 2) mentions as a way for remembering the above the verse (Bereshis 3: 19) "By the sweat of your brow you will eat bread."
Indeed, Psokim Uteshuvos (116: 2) and others quote the above as a source of not kissing the body of a sweating person.
Rabbi A. Bartfeld as revised by Horav Dovid Pam, Horav Aharon Miller and Horav Chanoch Ehrentreu Shlit'a
Important Numbers
