Halakhah su I Re 8:1

It also seems that that which Maimonides, may his memory be blessed, said that it is elucidated in Joshua is from this verse, but it is not a clear elucidation at all, as we have said. And that which is stated in I Kings 8:1, "And the Kohanim brought the Ark of the Covenant of the Lord to its place, to the sanctuary, to the Holy of Holies" should also not be difficult in your eyes. It is because the Levites were not permitted to enter the Holy of Holies that only the Kohanim brought it in. And [so] the main approach seems to be like the words of Nachmanides, may his memory be blessed, that the entire tribe is fit to carry the Ark; and as it is written (II Chronicles 35:3), "And he said to the Levites, etc. 'place the Holy Ark in the Temple that was built by Solomon son of David, the king of Israel, there is no longer a burden on your shoulders.'" Its matter is also that Israel would have no more need to carry the Ark form one place to another; but it does not indicate that if it were to move it, that it would not be done by the Levites, and this is clear and obvious to all. And [regarding] that which the Sages said (Chullin 24a) [that] blemishes disqualify the Kohanim but years do not, it is only the priestly duties that are not affected by age, but age does disqualify the Kohanim for the labor of carrying, as it does for the Levites (see Mishneh Torah, Laws of Vessels of the Sanctuary and Those who Serve Therein 2).

2. At Shacharit, we take out three Torah scrolls. From the first, we read from "And this is the blessing" [Deuteronomy 33:1] until the end of the Torah. From the second, we read "In the beginning" [Genesis 1:1] until "that God made" [2:3]. In the third we read "On Shmini Atzeret" [Numbers 29:35]. The haftarah is "And after Moses died" [Joshua 1:1]. In places where they do two days of Yom Tov, they only take two Torah scrolls out on the first day, reading five sections from Re'eh from the first from "every firstborn" [Deuteronomy 15:1]. If it is Shabbat, they read seven and start at "You should tithe" [14:22]. The maftir reads from the second Torah "On Shmini Atzeret." The haftarah is from Kings, "When Solomon finished..." [Kings I 8:1]. The Torah scrolls are returned. We say Kaddish and then announce [the addition of] "who makes the wind blow and the rain fall."