Musar zu Bereschit 49:8

And see further that the Holy One Blessed be He does not withhold [any] reward [that is due]. We have already mentioned above that in the counsel of Judah there was also great good for Joseph, for he rescued him from death. It was in this regard that Jacob said about him (Bereshith 49:8): "Judah — you, will your brothers praise" (see Rashi there). Our sages of blessed memory have said that because he saved Joseph from death the L-rd pitied the kingdom of the house of Judah, not destroying their seed until the destruction of the Temple, unlike the other kings of Israel, who were all temporary. When one finished his [allotted] time, another arose and killed him and his entire household, not leaving a trace — as opposed to the kings of the house of David, of the seed of Judah.