Midrash sobre Amos 3:2

R. Abahu introduced R. Safra to the minim [who collected government duties] as a great man. They freed him from duty for thirteen years. Once they met him and asked him to explain the following (Amos 3, 2) You, only have I loved, of all the families of the earth; therefore I will visit upon you all your iniquities.' If one is in bad humor, will he let it out on his friend? He could not explain this to them. They tied a piece of cloth around his neck and tormented him. R. Abahu came and asked them for the reason [of their treatment]. And they answered: "You introduced him to us as a great man, while he does not even know the explanation of a passage." "I told you he was a scholar in Talmud," remarked he, "but did I say that he was a master in the study of the Bible?" And to their question: "Why are you familiar with it?" he answered: "Because we have to discuss with you frequently, we give our attention to it." "Well," said they, "then you explain to us the above passage." He thereupon explained it to them thus: "I will do it in the form of a parable. There was once a creditor of two persons, one was a personal friend, and the other an enemy. From his friend, he demanded payments in small sums, but from his enemy he demands the whole debt at once."