ויתילדו על משפחתם לבית אבתם
The census was performed according to tribe. Thus, the people had to establish, either by written proof or valid testimony, that they belonged to a given tribe. Sforno explains that this strict requirement of family purity was based upon the need for the merit of their forefathers, which would protect them later on during their sojourn in the wilderness. Chazal teach that, when the nations of the world heard that Hashem had given His precious Torah to Klal Yisrael, they became envious. Why the Jews – and not them? Why were the Jews more worthy of receiving the Torah than…