משנה אויף במדבר 32:29

Rabbi Meir says: every stipulation which is not like that of the children of Gad and the children of Reuben is not a [valid] stipulation, as it say, “And Moses said to them, ‘If the children of Gad and the children of Reuben will pass [with you over the Jordan, then you shall give them the land of Gilead for a possession].” and it is also written, “But if they will not pass over with you armed, [then they shall have possessions among you in the land of Canaan]” (Numbers 32:29-30). Rabbi Hanina ben Gamaliel says: the matter had to be stated, for had it not been stated it would have implied that even in Canaan they should not inherit.

Rabbi Meir says: every stipulation which is not like that of the children of Gad and the children of Reuben is not a [valid] stipulation, as it say, “And Moses said to them, ‘If the children of Gad and the children of Reuben will pass [with you over the Jordan, then you shall give them the land of Gilead for a possession].” and it is also written, “But if they will not pass over with you armed, [then they shall have possessions among you in the land of Canaan]” (Numbers 32:29-30). Rabbi Hanina ben Gamaliel says: the matter had to be stated, for had it not been stated it would have implied that even in Canaan they should not inherit.

If a beast died a natural death this counts as an unavoidable accident [for which a hirer or paid guardian is not liable]. But if he tortured it and it died it does not count as an unavoidable accident [and the hirer and paid guardian would be liable]. If it was led up to the top of a crag and it fell down and died, this does not count as an unavoidable accident. An unpaid guardian may make a stipulation that he will be exempt from taking an oath, and a borrower [may make a stipulation that he will be exempt] from making restitution, and a paid guardian and a hirer [may make a stipulation that they will be exempt] from taking an oath or from making restitution.