This sermon was preached two months after that in the former part of the chapter. The priests and Levites preached constantly, but the prophets preached occasionally; both were good and needful. We have need to be taught our duty in season and out of season. The people were now going on vigorously with the building of the temple, and in hopes shortly to have it ready for their use and to be employed in the services of it; and now God sends them a message by his prophet, which would be of use to them.