Reference for Gittin 8:4

ורבנן בתראי סברי גזרינן מוליך אטו מביא

since on account of the festival pilgrimages [to Jerusalem] it is always possible to find witnesses. This may have been a good reason so long as the Temple was standing, but what of the time when there is no Temple? — Since there are [Jewish law] courts regularly established, witnesses can always be found.

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