Reference for Bava Metzia 197:8

אמר רב אשי הכא במאי עסקינן כגון שהיתה חצרו של שואל לפנים מחצרו של משאיל דכי משלחה לה ודאי להתם אזלא

If so, why state it? — It is necessary to state it only when there are narrow passages [in various directions in the courtyard]. I might think that he [the borrower] does not place full reliance [on its coming to him, for] perhaps it may stand there [sc. in a by-path] and not come to him: therefore we are taught that he places full reliance [that it will come].

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