A townsman who went to a walled city, or a city dweller who went to a town, if he intends to return to his home, he reads [at the same time] as in his home; but if not, he reads with them.  From what part of the Megillah must one read in order to fulfill his obligation? R’ Meir says: All of it. R’ Yehudah says: From There was a Jewish man. R’ Yose says: From After these things.