Reference for Ketubot 38:9

ת"ר שנים חתומין על השטר ומתו ובאו שנים מן השוק ואמרו ידענו שכתב ידם הוא אבל אנוסים היו קטנים היו פסולי עדות היו הרי אלו נאמנים ואם יש עדים שכתב ידם הוא זה או שהיה כתב ידם יוצא ממקום אחר משטר שקרא עליו ערער והוחזק בב"ד אין אלו נאמנין

Our rabbis taught: If two [witnesses] were signed on a document and died, and two [other witnesses] came from the street and said, “We know that it is their handwriting, but they were forced, they were minors, or they were disqualified witnesses,” they are believed. But if there are other witnesses that this is their handwriting or their handwriting comes out from another place, from a document which was challenged and then confirmed in a court of law, they are not believed.

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