Related for Ketubot 39:9
ת"ר כותב אדם עדותו על השטר ומעיד עליה אפילו לאחר כמה שנים אמר רב הונא והוא שזוכרה מעצמו רבי יוחנן אמר אע"פ שאין זוכרה מעצמו אמר רבה ש"מ מדרבי יוחנן הני בי תרי דידעי סהדותא ומנשי חד מנייהו מדכר חד לחבריה
Our Rabbis taught: A person may write [down] his testimony in a document and may through it give evidence even after some years. Huna said: Only when he remembers it by himself.Only when he remembers it by himself. Yohanan said: Even if he does not remember it by himself. Rabbah said: Learn from [the words of] R. Yohanan [the following]: These two people who know evidence and one of them has forgotten it, the other one may remind him of it.
Tosefta Ketubot
The legal power of a contract is stronger than that of witnesses [in some respects], and the legal power of witnesses is stronger than that of a contract [in other respects]. The power of a contract is stronger: a contract can remove a wife from her husband, which is not true of witnesses. The power of witnesses is stronger: witnesses that said "Ploni is dead", his wife can remarry; if "Ploni is dead" were written in a contract, his wife cannot remarry; if they said "What is written in this contract we heard but then forgot", his wife can remarry—a man who writes his testimony in a contract and testifies about it can continue to do so even after 100 years!
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