"release": I might think he also (releases) what was stolen from him or what he deposited with someone; it is, therefore, written "his claim" (and not the others).
And whence is it derived (that also released are) the wages owing a hired man and the credit given by a merchant? From ("his claim) that he has against his neighbor."
If in the end all are included, why is it written "his claim"? Just as "his claim" connotes his loan, so all that are construed as a loan (are released).
"He shall not exact it": This makes him subject to transgression of a negative commandment (if he does exact it).