The third aliyah begins by stating that the tribes of Reuvein and Gad have a lot of cattle. They see that the side of the Jordan that they are on now, before crossing the Jordan River into Israel, is an ideal place for so much cattle. They therefore ask Moshe if they can have their inheritance outside of Israel, on this side of the Jordan. Moshe answers them that this is like the matter of the spies, in that their not wanting to go into the land of Israel will discourage everyone else from wanting to proceed into the land. They reply to Moshe that they will leave their cattle and families here, but their men will go with the other Jews into Israel and conquer it with them. And only after all the rest of the Jews inherit their land, they will return to this side of the Jordan.