A parenthesis, relating why it was that David did not rather resort to the ancient Tabernacle, which then stood at Gibeon. (Comp. 1 Chronicles 16:39-40.)
Related Commentaries of 1 Chronicles 21:29
1 Chronicles 21:29-30
29 For the tabernacle of the LORD, which Moses made in the wilderness, and the altar of the burnt offering, were at that season in the high place at Gibeon.
30 But David could not go before it to enquire of God: for he was afraid because of the sword of the angel of the LORD.