민수기 11:10의 주석

בכה למשפחתיו [THEN MOSES HEARD THE PEOPLE] WEEP THROUGHOUT THEIR FAMILIES — i.e. the members of each family gathered together and wept in order to display their discontent in public. Our Rabbis, however, said that למשפחתיו means “the people wept because of family affairs” — because of the intermarriage of blood-relaltives that had been forbidden to them (Sifrei Bamidbar 90; Yoma 75a).

ויחר אף ה׳ מאד. G'd's anger was kindled very much. The reason why the Torah describes G'd's anger as מאד, "very much," is that people who fall victim to seduction by Satan have been victimised, in a sense. The same could not be said of the people described in our paragraph who had actually provoked the evil urge within themselves. There is no category of sin which is greater than that.

The intimate relations forbidden. You might ask: Surely the intimate relations had already been forbidden to them, so why did they not weep before? The answer is that before the division into the camps, everyone was intermingled and therefore the intimate relations went unnoticed. However once they were divided into camps, each and every tribe was alone and the women from one tribe were not found among another, rather everyone was from the same tribe. Alternatively, before the division into the camps, all of the tribes were intermingled and people could commonly find other women who were not forbidden relations, thus they did not pay attention to the forbidden relations. However, once they divided and each tribe was left alone together with the forbidden relations, therefore they wept. This is not in accordance with the explanation of Re’m who says that even though the entire Torah had been handed over to Moshe, it is possible that the passage of forbidden relations has not been told over to Yisroel until just before their departure from Mount Sinai. (Kitzur Mizrochi) explains in the name of the Minchah Belulah that they combined the complaint about the forbidden relations with their complaint about the manna. For it says in the Midrash that the Omer-portion would disclose who’s son was a mamzer (a child born from illicit relations), since his Omer-portion would be found in the tent of his father. Thus they complained about the manna, but their main complaint was over forbidden relations.