Reference for Bava Metzia 41:4

גופא סמפון שיש עליו עדי' יתקיים בחותמיו אין עליו עדים ויוצא מתחת ידי שליש או שיוצא לאחר חיתום שטרות כשר

This is also conclusive, for the final clause teaches: 'But if it does not bear the signatures of witnesses it is invalid.' Now, what is the meaning of [the words], 'It does not bear the signatures of witnesses'? If I should say that [it means that] there are no signatures of witnesses on it at all — is it necessary to say that is invalid? Therefore we must assume that they are witnesses to the endorsement [of the note by the Court].

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