Musar do Diwrej ha-jamim II 10:16

And see another extremely awesome thing which unraveled itself in the course of time, measure for measure. For Joseph stumbled in the sin of lashon hara [against his brothers] as related in the Torah. And his brothers did not want, by any means, to forgive him, relating to him in the extreme of din, saying (Bereshith 37:20): "Let us go and kill him (that is: "Let us sic the dogs on him" and the like,) and they wished to sell him as a slave because of this, though Judah defended him and did not allow them to kill him, as it is written (Bereshith 37:26): "What profit if we kill our brother, etc." Still, he by no means wanted to forgive him, saying (Ibid. 27): "Let us go and sell him." And because of this, in the succeeding generations, when one of the seed of Judah stumbled in the issur of accepting lashon hara, the distinctive one of the seed of Joseph would by no means forgive him. And who is it that stumbled in this way? No less than our lord, King David, may peace be upon him, who believed the evil that Tziva spoke of Mefibosheth, and said (II Samuel 19:30): "You [Mefibosheth] and Tziva shall divide the field" — at which a Heavenly voice came forth and said: "Rechavam [of the seed of Judah] and Yaravam [of the seed of Joseph] shall divide the kingdom." And, as it is written in Scripture, that after the death of Solomon, Yaravam and all of Israel came to Rechavam and besought him to ease somewhat his yoke upon them and they would serve him, and he answered them (I Kings 12:14): "My father [Solomon] chastised you with whips, but I will chastise you with scorpion-thorns" — whereupon all of them answered (II Chronicles 10:16): "Each to your tents, O Israel," and they crowned Yaravam. And the underlying cause was David's acceptance of lashon hara. As our sages of blessed memory said: "If David had not accepted lashon hara, the kingdom of the house of David would not have been divided and Israel would not have served idolatry, and we would not have been exiled from our land." And all of this is "measure for measure," as we have written.