Reference for Bava Batra 196:11

רומו כחצי ארכו וכחצי רחבו ראיה לדבר רשב"ג אומר כבנין ההיכל: ראיה לדבר מאן קתני לה איכא דאמר רשב"ג קתני לה והכי קאמר ראיה לדבר מנין אמר רשב"ג הכל כבנין היכל

R. ISHMAEL SAID: THIS IS AN OX STALL. HE WHO DESIRES TO ERECT etc. Who is the author of [the statement on] the OX STALL? — Some say the author is R. Ishmael, and some say R. Akiba is the author. Those who say R. Akiba is the author explain it thus, 'Although [the size] is [that of] an ox stall, one sometimes makes his dwelling [as small] as an ox stall'. And those who say R. Ishmael is the author, explain it thus, 'Because he who desires to erect an ox stall makes [it] four cubits by six.'

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