We do not say this; nor do we say to one who does not run his fingers through his beard during ablution: “You are an innovator!”
In matters such as these, one should know the proper guidelines governing disagreement.
In any case, we say that anyone who borrows a book from a library must never write marginal notes in it. If he finds an unmistakable error, may he correct it? No, he may not correct it. Rather, he should alert the librarian and say: “This word on such-and-such page is incorrect.” If the librarian tells him to correct it, then he may do so; and if the librarian undertakes to correct it himself, that is his right.
The author then mentioned matters in which the lender and borrower differ, saying:
“If he says, ‘I rented it to you,’ and the other says, ‘Rather, you lent it to me,’ or vice versa, immediately after the contract, the statement of the one claiming that it was a loan is accepted. But after a period of time has elapsed, the owner’s statement is accepted regarding the customary rental fee. ...........”
“If he says, ‘I rented it to you,’ and the other says, ‘Rather, you lent it to me,’ or vice versa, immediately after the contract, the statement of the one claiming that it was a loan is accepted.” If the owner says, “I rented it to you,” meaning, “I want rent from you,” while the other says, “Rather, you lent it to me, so I owe no rent,” then the phrase “immediately after the contract” means that this disagreement occurs directly after the contract. For example, he says, “Lend me this book,” so the owner lends it to him; then, five minutes after taking it, he says, “You lent it to me,” and the owner replies, “Rather, I rented it to you.” In that case, the statement of the one claiming it was a loan is accepted along with his oath. If we accept the statement of the one claiming it was a loan, the matter is easily resolved, because if we tell the owner, “Your statement is rejected, and the statement of the one claiming a loan is accepted,” the owner will say, “Since it is a loan, give it back to me.”