משנה אויף דברים 19:17

The following are believed to testifying when they are grown-up about what they saw when they were minors:A person is believed to say “This is the handwriting of my father”, “This is the handwriting of my teacher”, “This is the handwriting of my brother”; “I remember that that woman went out with a hinuma and an uncovered head”; “That that man used to go out from school to immerse in order to eat terumah”; “That he used to take a share with us at the threshing floor”; “That this place was a bet ha-peras”; “That up to here we used to go on Shabbat”; But a man is not believed when he says: “So-and-so had a path in this place”; “That man had a place of standing up and eulogy in this place”.

The oath of testimony applies to men and not to women, to non-relatives and not to relatives, to those qualified [to bear witness] and not to those unqualified. And it applies only to those eligible to bear witness. Whether [uttered] in front of the court or not in front of the court, if [uttered] with his own mouth; [but if adjured] by the mouth of others he is not liable unless he denies it before the court, these are the words of Rabbi Meir. But the Sages say: “Whether [uttered] with his own mouth or [adjured] by the mouth of others he is not liable unless he denies it before the court.”