Numbers 32:5

wherefore, said they, if we have found grace in thy sight, let this land be given unto thy servants for a possession, and bring us not over Jordan. Even if this request was made in consequence of the supposition that the other tribes would be fully able to conquer the land west of the Jordan, the real Canaan, it was an evidence of selfishness on the part of these two tribes and showed that they did not feel the bond of unity which held them together with the other tribes. It seems that at this time the two tribes did not even have the intention of aiding their brethren in gaining possession of the Land of Promise.