Charles Ellicott Commentary 1 Chronicles 23:26

"and also the Levites shall no more have need to carry the tabernacle and all the vessels of it for the service thereof." — 1 Chronicles 23:26 (ASV)

And also unto the Levites; they shall no more carry... —Rather, And the Levites also do not (now) have to carry the dwelling and all its vessels for its service, as they had to do in the wanderings of Israel in the desert. The sacred dwelling-place (mishkân) had long been fixed at Gibeon; and the service of the Levites was so much lighter, as in earlier times they not only had to carry them around from place to place, but also to guard the holy tent and its belongings against the attacks of marauders. The inference is that as the duties had become so much less arduous, they might well be undertaken at an earlier age than the ancient custom permitted.

They shall no more carry. —Compare the same infinitival construction in 2 Chronicles 5:11.