R’ Meir says: Any condition which is not like the condition of the children of Gad and the children of Reuven is not a condition, as it says (Num. 32:29): And Moses said to them: If the children of Gad and the children of Reuven will cross ..., and it is written (ibid. v. 30): But if they will not cross zealously ... R’ Chanina ben Gamliel says: It was necessary for the matter to be stated, because otherwise, it is implicit that even in the Land of Canaan they shall not inherit.