If he says, "He told me, 'I owe him,'" or says, "So-and-so told me that he owes him," - it is as if he said nothing. Only direct observations are admissible, such as a loan taking place, whereas his statements constitute hearsay. However, it is acceptable if he says that the defendant appointed them as witnesses and then admitted his debt to the plaintiff. Then, they bring in the second witness. The testimonies should correspond.
The ruling of the majority of judges is accepted, but if one says, "I don't know," they add two more judges at a time. After the verdict is announced, the judges cannot reveal individual opinions because "Do not be a gossipmonger..."
Art: In the Corridor of the District Court by Nikolaj Alekseevich Kasatkin