before the ark. This was now in Zion (2 Samuel 6:12-17). But the altars and vessels were in the Tabernacle at Gibeon (2 Chronicles 1:3-6).
Asaph and his brethren. These were left in Zion "before the Ark", while the priests ministered "before the Tabernacle" (see 1 Chronicles 16:39 below), until Divine worship should be reconstructed in the Temple.