When Israel received the Torah from God, all the other nations envied them and said: "Why were these choosen by God out of all the nations?" But God stopped their mouths, replying: "Bring Me your family records, and My children shall bring their family records." The nations could not prove the purity of their families, but Israel stood without a blemish, every man among them ready to prove his pure descent, so that the nations burst into praise at Israel's family purity, which was rewarded by God with the Torah for this its excellence.