Adam Clarke on 1 Chronicles 16:22

Touch not mine anointed - By this title the patriarchs are generally understood: they had a regal and sacerdotal power in the order of God. In the behalf of the patriarchs God had often especially interfered: in behalf of Abraham, Gen 12:17; Gen 20:3; and of Jacob, Gen 31:24; Gen 34:26; Gen 35:5. But the title may be applied to all the Jewish people, who were the anointed, as they were the elect and peculiar people of God. See on Heb 11:26 (note).