Ketubot

But if he  is a scholar,  even he himself  [may remind the witness].  As that case of R. Ashi: He knew evidence for R. Kahana, [and] he  said to him:  Does the master remember that evidence?  And he  said to him:  No. But was it not so and so?  He  replied: I do not know. In the end, R. Ashi reminded himself, and he gave evidence for him.  He  saw that R. Kahana was surprised,  [so] he  said to him:  Do you think [that] I relied upon you? I threw it upon my mind  and I remembered it. We learnt elsewhere:  Mounds which are near a town or a road, whether they are new or old, are unclean;  those [mounds] which are distant — if they are new,  they are clean,  and if they are old,  they are unclean.  What is near? Fifty cubits.  And what is old? Sixty years.  [This is] the view  of R. Meir. R. Judah says: 'near', [denotes] when there is none nearer; 'old', when one remembers it.  [Now] what is [meant by] a town and what is [meant by] a road? Shall I say: [by] a town is [meant] an ordinary town, [and by] a road is [meant] an ordinary road? Do we presume uncleanness out of doubt? Did not Resh Lakish say: They  found some pretext  and declared the land of Israel unclean?  — Said R. Zera: [By] a town is [meant] a town which is near a burial place, and [by] a road is [meant] a road [leading] to a burial place. I grant you [in the case of] a road [leading] to a burial place,  because sometimes it might happen [that a funeral took place] at twilight, and it chanced that they buried it  in the mound.  But [in the case of] a town which is near a burial place — all go to the burial place!  — Said R. Hanina: Because women bring there  their abortions and lepers  [bring there]  their arms.  [And it is assumed that] till fifty cubits she  goes alone,  but for a longer distance  she takes a man with her and [then] she goes to the burial place.  Therefore, we do not presume uncleanness in Eretz Israel.  R. Hisda said: You may infer from [the words of] R. Meir  [that] one remembers  evidence till sixty years, for a longer  [period than sixty years] one does not remember. But it is not so, [for] there  [he does not remember the evidence after sixty years] because it  is not his concern,  but here,  since it is his concern, even for a longer [period  he] also [remembers the evidence]. MISHNAH. [IF] ONE  WITNESS SAYS, 'THIS IS MY HANDWRITING AND THAT IS THE HANDWRITING OF MY FELLOW, AND THE OTHER [WITNESS] SAYS, 'THIS IS MY HANDWRITING AND THAT IS THE HANDWRITING OF MY FELLOW,' THEY ARE BELIEVED. [IF] ONE SAYS, 'THIS IS MY HANDWRITING,' AND THE OTHER SAYS, 'THIS IS MY HANDWRITING,' THEY MUST JOIN TO THEMSELVES ANOTHER [PERSON].  [THIS IS] THE VIEW  OF RABBI. BUT THE SAGES SAY: THEY NEED NOT JOIN TO THEMSELVES ANOTHER [PERSON], BUT A PERSON IS BELIEVED TO SAY, 'THIS IS MY HANDWRITING'.GEMARA. If you should find [that] according to the view of Rabbi