Zevachim Chapter 14, Mishnah 5. We continue from the point where we left off in the previous Mishnah - from the moment the Jewish people left the wilderness.
"Bau legilgal":
The Mishkan was erected in a place called Gilgal - a village close to Jericho, the point of entry into the Land of Israel. There, the Mishkan was set up more or less as it was in the wilderness: surrounded by curtains and hangings.
"Vehuteru habamos" - at that point, bamos, private altars, once again became permitted. In fact, even the altar in front of the Mishkan in Gilgal itself was a large bamah.
The laws of eating the sacrifices offered on the large bamah in Gilgal:
"Kodshei kodashim ne'echalin lifnim min hakela'im" - the kodshei kodashim, which are the meal offerings, the sin offering, and the guilt offering, were eaten inside the hangings that were wrapped around the Mishkan in Gilgal, as it is stated: "In the courtyard of the Tent of Meeting they shall eat it" - inside the courtyard of the Tent of Meeting, and therefore it must be eaten in that area within the courtyard.
"Vekodashim kalim bechol makom" - sacrifices of lesser holiness were eaten anywhere, meaning anywhere in the vicinity of the Jewish people.
The reason for this: the Jewish people were occupied for seven years with conquering the land and seven years with dividing it - distributing the Land of Israel, and during those fourteen years they were scattered throughout the land and did not have a central location. Therefore, eating kodashim kalim was permitted anywhere in the vicinity of the Jewish people.
In summary: The period of the Mishnah before us is the period of the Mishkan in Gilgal, which lasted fourteen years - seven years of conquest and seven years of division. During this period, bamos were permitted, kodshei kodashim were eaten inside the hangings, and kodashim kalim anywhere.