Midrash sobre I Reyes 8:46

Our rabbis teach us that the borrower, the guarantor, the witnesses, and the scribes are all considered culpable, (for without them the moneylender would not have loaned his money on interest). Therefore, all of them shall be punished. Whence do we learn that the borrower is punished? It is written: Thou shalt not cause thy brother to lend upon interest (Deut. 23:20). To what can interest be likened? To a person who does not feel or notice the bite of a snake until the swelling appears. Similarly, interest is not felt until it has increased for the debtor. If thou at all take thy neighbor’s garment to pledge (Exod. 22:25). The Holy One, blessed be He, said to him: If he is in debt to you, you are also in debt to Me, as it is said: If they sin against Thee—for there is no man that sinneth not (I Kings 8:46).