Related על כתובות 39:14

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!