The Jewish Babylonian Talmud – Section Moed – Tract Sabbath – Regulations concerning throwing from one ground into another.
p. 189 TRACT SABBATH. CHAPTER XI. REGULATIONS CONCERNING THROWING FROM ONE GROUND INTO ANOTHER. MISHNA: One who throws a thing from private into public or from public into private ground is culpable. From private into private ground, by way of public ground, R. Aqiba holds him to be culpable, but the sages declare him free. How so? If two balconies face each other across a street, one who transfers or throws something from one into the other is free; if the two balconies, however, are in the same building, he who transfers a thing from one into the other is culpable, but he who throws is free; because the work of the Levites (in the tabernacle) was as follows: From two wagons facing each other in public ground boards