Chapter 29
Laws Derived from Isaiah: Running, Walking, Commerce, Measuring, Reading, Speaking
GIFTS AND TRANSFERS OF OWNERSHIP ON SHABBATH AND YOM TOV
30.a. 1) a) One should not formally abandon the ownership of property on Shabbath or Yom Tov, except for the purpose of a mitzva.
b) An example of the exception is where one abandons the ownership of chametz on a Shabbath which is the day preceding Passover.
2) Notwithstanding this rule, one may throw something out into the street, despite the fact that it thereby becomes ownerless, provided
a) there is an eiruv and
b) the item in question does not constitute a nuisance to the public.
30.b. 1) One may acquire ownerless property on Shabbath or Yom Tov.
2) A person finding lost property on Shabbath or Yom property Tov may, thus, pick it up and keep it (unless this is forbidden for other reasons).
31. It is prohibited to perform the mitzva of redeeming the firstborn on Shabbath or Yom Tov, even if the period of thirty days following the birth expires on that day.

