ציטירנדיקער פּירוש אויף דברי הימים א 5:1

אלה תולדות יעקב יוסף, “These are the descendants of Yaakov, Joseph.” It would have seemed appropriate to list all of Yaakov’s sons. and daughters. According to the plain meaning of the text they are all subsumed under the name of Joseph seeing he combined all the good characteristics possessed by his brothers in his own person. He possessed the birthright which normally should have been Reuven’s as we know from Chronicles I 5,1 “when he desecrated the couch of his father, his birthright was given to (the tribe of) Joseph.” He possessed the prophetic qualities of Levi as mentioned by the Torah when he interpreted the dreams of the butler and the baker (Genesis 41,13). He also combined within himself the Royal Powers of Yehudah as the Torah testifies in Genesis 42,6 “Joseph was the one who ruled the land (earth?).” He possessed the intelligence for which Issachar is famed, as we know from Genesis 41,40 “there is none as wise and full of insight such as you.”

ראובן בכורי אתה, Reuven you, who are my firstborn,” and who should have received a double share of my inheritance; and you who should also have shouldered the yoke of being the priest among your siblings, and from whom eventually the first King of the Israelites should have been crowned, (in accordance with Chronicles II 21,3) “and the title of Royalty he gave to Yehoram for he was the firstborn,” you will not enjoy all this as it has been transferred to Joseph, and the priesthood to Levi, and the Royalty to Yehudah, all because you have been as unstable as water, as a kettle that boils over and spills its contents.” (Compare Chronicles I 5,1) As a result, the only privilege a firstborn enjoys that you still possess is the hollow title of having been the firstborn of my sons. In this respect you are comparable to water, the first physical element in the universe. You are the original, (oldest) of the people that make up the Israelite nation, the 12 tribes.” Water is insubstantial; it cannot be poured out completely, as opposed to something dry which can be emptied without the loss of any part of it. In the Talmud, tractate Shabbat folio 55, where the meaning of the word פחז in our verse is discussed by different scholars, [there is a lengthy debate about what constituted the sin of a number of illustrious people such as Reuven, the sons of High Priest Eli, Solomon, Yoash, Pinchos, David, King Yoshia, and others Ed.] each offering a different opinion; the conclusion arrived at is that the scholars of the Mishnah agreed to disagree. The common denominator of their discussion is that the text describing their respective sins cannot be understood at its face value but is a metaphor describing a character weakness on the occasion. (B’reshit Rabbah 99,6)

“Then you defiled my bed that went up.” At that time, you also defiled my bed [lit. “my couch”], meaning my marital bed, so that I would not have any more children with her [Bilhah]. You did this out of greed for wealth, so that you would have a larger portion of the inheritance. This is also how Ramban explained it. Therefore, I am penalizing you regarding wealth by removing your right of the firstborn to take a double portion, and it will [instead] go to Joseph, who had a generous eye, who sustained his father and his brothers, as it is written When he defiled his father’s bed, his birthright was given to the sons of Joseph (1 Chronicles 5:1).