Musar for Shabbat 193:15
תניא נמי הכי בתוך ג' דברי הכל חייב למעלה מי' אינו אלא משום שבות ואם היו רשויות שלו מותר מג' ועד עשרה ר"ע מחייב וחכמים פוטרין
and if they are [both] his own grounds, it is permitted [at the very outset]; between three and ten, R. Akiba ruled [him] culpable, while the sages exempt him. The Master said: 'And if they are [both] his own grounds, it is permitted.' Shall we say that this is a refutation of Rab? For it was stated: If there are two houses on the two [opposite] sides of a street, Rabbah son of R. Huna said in Rab's name: One may not throw [an object] from one to another; while Samuel ruled: It is permitted to throw from one to another!<span class="x" onmousemove="('comment',' Both houses must belong to the same person. for otherwise Samuel would certainly not permit it, V. 'Er., Sonc. ed.. p, 593 notes. ');"><sup>27</sup></span>