Musar su Genesi 39:10

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.

Now there is one who does not listen and is rewarded and this would be Joseph. For it is said "that he hearkened not unto her, to lie by her, or to be with her" (Gen. 39:10). And what was his reward? "And Joseph was the ruler over all the land" (Gen. 42:6).

The converse is also true, Heaven forbid. If a person commits a single transgression one accuser is created. If he commits two transgressions two accusers are created. Then, after he dies, those transgressions take on the form of a woman and lead him to Gehinnom. Thus the Torah tells us that Yosef refused to listen to Potiphar’s wife “to lie with her, to be with her” (Bereishis 39:8-10). The Sages explain, “ ‘To lie with her’ — in this world; ‘to be with her’ — in the World to Come” (Sotah 3b).