Reference for Eruvin 31:16

משום דלא דמי פסולא דרישא לפסולא דסיפא פסולא דרישא כדי שלא יזדקר הגדי בבת אחת פסולא דסיפא שלא יהא פרוץ כעומד

For, since it was stated: 'If the gaps exceeded the standing parts it is forbidden [to sow corn] even over against the standing parts', it follows that if they were equal to the standing parts [the sowing] is permitted. This proves it.

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