Adam Clarke on 1 Kings 8:4

They brought up - the tabernacle - It is generally agreed that there were now two tabernacles at Gibeon, and the other in the city of David, which one David had constructed as a temporary residence for the ark, in the event of a temple being built. Which of these tabernacles was brought into the temple at this time, is not well known; some think both were brought in, in order to prevent the danger of idolatry. I should rather suppose that the tabernacle from Gibeon was brought in, and that the temporary one erected by David was demolished.