(Beraisa): All seven days of the Milu'im, Moshe anointed the Mishkan, assembled it and dismantled it, and did the Avodos on it. On the eighth day, he assembled it and did not dismantle it;

R. Yosah bei R. Yehudah says, even on the eighth day, he assembled it, anointed it and dismantled it.

Inference (R. Ze'ira): This teaches that [he holds that] what was assembled at night is Pasul for Avodah of the day. (If not, there was no reason to dismantle it on the eighth day.)

Consequence: It is found that according to R. Yochanan, R. Yosi bar R. Yudah holds that it was assembled 21 times and dismantled 20 times. (Each day it was assembled before dawn, and dismantled and assembled for the sake of Avodas ha'Yom, and dismantled and assembled before night.) According to R. Chiya bar Yosef, R. Yosi bei R. Yudah holds that it was assembled 14 times and dismantled 13 times.

Question: What is the source that they dismantled it [during the Milu'im]?

Answer (Ze'irah): "Va'Yhi b'Yom Kalos Moshe Lehakim Es ha'Mishkan'' - it was the day that completed his constructions.