the captains: That is, the chief of the several orders; not military captains. 1 Chronicles 12:28, 1 Chronicles 23:2, 1 Chronicles 24:5-6; 2 Chronicles 23:1, 2 Chronicles 23:9
prophesy: The word prophesy, here, seems to mean no more than praising God by singing inspired prophetical hymns. 1 Chronicles 25:3; 1 Samuel 10:5; 2 Kings 3:15; 1 Corinthians 14:24-26
harps: 1 Chronicles 15:16-21, 1 Chronicles 16:4-5, 1 Chronicles 16:42, 1 Chronicles 23:5-7; 2 Chronicles 23:13, 2 Chronicles 29:25-26, 2 Chronicles 31:2, 2 Chronicles 34:12; Ezra 3:10-11; Nehemiah 12:24, Nehemiah 12:27, Nehemiah 12:43-46; Psalms 81:2, Psalms 92:1-3, Psalms 150:3-5; Revelation 15:2-4