Eruvin 50B

ומר סבר: לקרבן גדול קא מכוין.

And the other Sage, R' Yoḥanan, maintains: He intends to bring a large offering of 80 loaves, and therefore none of the loaves are consecrated.

אמר אביי: לא שנו אלא באילן שתחתיו שתים עשרה אמה, אבל באילן שאין שתים עשרה אמה, הרי מקצת ביתו ניכר.

Abaye said: They only taught Rav’s ruling that one cannot establish residence beneath a tree without precisely defining a particular location, with regard to a tree beneath which there are at least 12 cubits. However, with regard to a tree beneath which there are not 12 cubits, he can establish residence there, as at least part of his residence is conspicuous. In that case, there is a partial overlap between the middle 4 cubits beneath the tree and the 4 cubits nearest him and the 4 cubits farthest from him, and consequently each necessarily contains at least part of his residence.

מתקיף לה רב הונא בריה דרב יהושע: ממאי דבארבעי מציעתא קא מסיים, דלמא בארבעי דהאי גיסא ובארבעי דהאי גיסא קמסיים!

Rav Huna, son of Rav Yehoshua, strongly objects to this: From where is it ascertained that he designates his residence in the 4 middle cubits, so that there is a partial overlap with both the nearest and the farthest cubits; perhaps he designates it in the 4 cubits on this side or in the 4 cubits on the other side? Since he does not know which location he designated as his residence, he did not establish residence anywhere beneath the tree.

אלא אמר רב הונא בריה דרב יהושע: לא שנו אלא באילן שתחתיו שמונה אמות, אבל באילן שתחתיו שבע אמות ⁠— הרי מקצת ביתו ניכר.

Rather, Rav Huna, son of Rav Yehoshua, said: Abaye’s statement must be emended. They taught this only with regard to a tree that has at least 8 cubits beneath it. However, with regard to a tree that has only 7 cubits beneath it, even if one did not establish a particular location, he acquires residence, as at least part of his residence is conspicuous, as any 4 cubits must include at least 1 cubit of his residence.