Mishnà su Esodo 23:11

Until when may they plow an orchard in the sixth year? Bet Shammai say: as long as such work will benefit the fruit. And Bet Hillel says: till Atzeret (Shavuot). The views of this [school] are close to those of the other.

Beth Shammai says: [produce pronounced] ownerless with respect to the poor [only] is counted as ownerless. But Beth Hillel says: it is not counted as ownerless unless it is made ownerless also with respect to the rich, as in the year of release (shmittah). If all the sheaves of the field were of one kav each and one was of four kavs, and it was forgotten, Beth Shammai says: it does not count as forgotten, And Beth Hillel says: it counts as forgotten.

Rabbi Judah says: there are six instances of lenient rulings by Beth Shammai and stringent rulings by Beth Hillel.The blood of a carcass: Beth Shammai pronounces it clean, And Beth Hillel pronounces it unclean. An egg found in a [bird’s] carcass: if the like of it were sold in the market, it is permitted, and if not, it is forbidden, according to the opinion of Beth Shammai. And Beth Hillel forbids it. But they agree in the case of an egg found in a trefa [bird] that it is forbidden since it had its growth in a forbidden condition. 3+4) The blood of a non-Jewish woman and the blood of purity of a leprous woman: Beth Shammai pronounces clean; And Beth Hillel says: [it is] like her spittle and her urine. One may eat fruits of the seventh year with an expression of thanks and without an expression of thanks [to the owner of the field], according to the opinion of Beth Shammai. But Beth Hillel says: one may not eat with an expression of thanks. Beth Shammai says: a waterskin [is liable to become impure only if it is] tied up and remains unimpaired. And the school of Hillel says: even if it is not tied up.

Wild beasts come to the world for swearing in vain, and for the profanation of the Name. Exile comes to the world for idolatry, for sexual sins and for bloodshed, and for [transgressing the commandment of] the [year of the] release of the land. At four times pestilence increases: in the fourth year, in the seventh year and at the conclusion of the seventh year, and at the conclusion of the Feast [of Tabernacles] in every year. In the fourth year, on account of the tithe of the poor which is due in the third year. In the seventh year, on account of the tithe of the poor which is due in the sixth year; At the conclusion of the seventh year, on account of the produce of the seventh year; And at the conclusion of the Feast [of Tabernacles] in every year, for robbing the gifts to the poor.