[If] witnesses said: “This is our handwriting, but we were coerced,” [or] “we were minors,” [or] “we were unfit for testimony,” these are believed. If, however, there are witnesses that it is their handwriting, or if their handwriting is verified from another source, they are not believed.

[If] this one says: “This is my handwriting, and this is the other’s handwriting,” and this one says: “This is my handwriting, and this is the other’s handwriting,” these are believed. [If] this one says: “This is my handwriting,” and this one says: “This is my handwriting,” they must join to themselves another person; [these are] the words of Rabbi. The Sages, however, say: They need not join another person to themselves; rather, a person is believed to say: “This is my handwriting.”