Mishnà su Levitico 18:78

Moses received the Torah at Sinai and transmitted it to Joshua, Joshua to the elders, and the elders to the prophets, and the prophets to the Men of the Great Assembly. They said three things: Be patient in [the administration of] justice, raise many disciples and make a fence round the Torah.

The variegation of the snow-like whiteness is like wine mixed with snow. The variegation of the lime-like whiteness is like blood mixed with milk, the words of Rabbi Ishmael. Rabbi Akiva says: the reddishness in either of them is like wine mixed with water, only that in the snow-like whiteness the color is bright while in that of lime-like whiteness it is duller.

Rabbi Elazar of Modiin said: one who profanes sacred things, and one who despises the festivals, and one who causes his fellow’s face to blush in public, and one who annuls the covenant of our father Abraham, may he rest in peace, and he who is contemptuous towards the Torah, even though he has to his credit [knowledge of the] Torah and good deeds, he has not a share in the world to come.

Beth Shammai permits the rival wives [of a deceased brother to be married] to the [surviving] brothers; But Beth Hillel forbids them. If they have performed halitzah, Beth Shammai pronounce them unfit to [marry into] the priesthood, But Beth Hillel pronounced them fit. If they have married their brother-in-law, Beth Shammai pronounce them fit [to marry into the priesthood], But Beth Hillel pronounced them unfit. And although these pronounce unfit and these pronounce fit, Beth Shammai did not refrain from marrying women from [the daughters of] Beth Hillel, nor did Beth Hillel refrain from marrying women from [the daughters of] Beth Shammai. And in the case of all matters of purity and impurity in respect to which these pronounce pure and these pronounce impure, they did not refrain from preparing foods requiring a condition of purity each by means of [the vessels of] the other.

[In the case of] three brothers, of whom two were married to two sisters and one was unmarried, if one of the husbands of the sisters died and the unmarried one betrothed her (maamar), and afterwards his other brother died, Beth Shammai says: his wife remains with him, and the other [widow] is released on the grounds of [the law forbidding] the wife’s sister. But Beth Hillel says: he should put away his wife with a get and halitzah, and the wife of his brother [he should put away] with halitzah. This is the case of which they said: woe to him because of his wife, and woe to him because of his brother’s wife!