"and they shall eat it in your gates and be sated": Give them as much as they need to satiate them — whence it was ruled: The poor man is given no less in the (allocation of the poor-tithe in the) threshing floor than half a kav of wheat or a kav of barley. These are the words of R. Yehudah. R. Meir says: a kav.
"in your gates": We are hereby apprised that it is not to be taken outside of Eretz Yisrael. They said: There was a family of the house of Navtalah in Jerusalem, who were given six hundred talents of gold by the sages, and who would not take them outside of Jerusalem.