1666. The borrower is bound to bestow the care of a prudent administrator in the safe-keeping and preservation of the thing loaned.
He or she cannot apply the thing to any other use than that for which it is intended by its nature or by agreement.
1667. If the borrower apply the thing to any other use than that for which it is intended, or use it for a longer time than is agreed upon, he or she is liable for the loss of it arising even from a fortuitous event.
1668. If the thing lent be lost by a fortuitous event from which the borrower might have preserved it by using his or her own, or if being unable to save both things he or she prefers to save his or her own, he or she is liable for the loss.
1669. If the thing lent deteriorate by the use alone for which it is lent and without fault on the part of the borrower, he or she is not liable for the deterioration.
1670. The borrower cannot retain the thing lent for a debt due to him or her by the lender, unless such debt is for expenses necessarily incurred in the preservation of the thing.
1671. If in order to use the thing the borrower have incurred expense, he or she is not entitled to recover it from the lender.
1672. If several persons conjointly borrow the same thing, their obligations in respect of it towards the lender are joint and several.