Reference for Bava Metzia 235:6

מי שהיה כותלו כו': הא מדקתני סיפא הילך יציאותיך מכלל דפנינהו עסקינן טעמא דפנינהו הא לא פנינהו לא

For if we taught [it] in connection with a dwelling, [it might be said that] only there does Samuel state his ruling, because it is unusual for a man to dwell partly in one place and partly in another; but with respect to sowing, where it is quite usual for a man to sow here a little and there a little, I might say that he agrees with Rab. Whilst if only the present dispute were stated, [I might argue that] only here does Rab hold this view; but in the other case, he agrees with Samuel. Hence both are necessary.

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