Musar su Salmi 125:4

רק אדמת הכהנים לא קנה . Gratitude is a virtue which must be practiced even with pagans. The Egyptian clergy had saved Joseph when he was brought to trial before them accused of the attempted rape of Potiphar's wife. When these clergymen realized that the tear in the garment Joseph left behind was in the front, they realized that Joseph was innocent [based on ספר הישר Ed.] As a result, Joseph now repaid them in kind.

And see the greatness of the hatred borne against the wicked. For aside from their being driven away from the table of the King of kings, the Holy One Blessed be He, as we find in Shabbath 149b: "You are righteous, O L-rd; evil will not dwell in Your dwelling place" — even at a time when the prophets and the saintly ones implore mercy for Israel, they have no desire at all to implore mercy for the wicked. To the contrary, they intimate in their prayer that they ask nothing at all for the wicked, as it is written (Psalms 125:14): "Do good, O L-rd, for the good ones and for the upright in their hearts."