Who is the idol Shepherd? who?

Verse 1
Who is the idol shepherd? who
The slighted flock of Jesus leaves?
The man that steals his Saviour’s due,
And human praise with joy receives:
The charge of souls he undertakes;
But when the storms of trouble rise,
He sees the wolf, the sheep forsakes,
And basely as an hireling flies.

Verse 2
Justice divine with sharpest sword
His arm and his right eye shall smite;
(Hear this ye traitors to your Lord)
Bereave him of his power and light:
Soon as the threaten’d curse takes place,
The wretch receives his instant doom,
Wither’d is all his strength of grace,
And all his light is hellish gloom.

Verse 3
Lord, help me, that I never may
My gracious power and knowledge lose,
But meekly with thy people stay,
Their burthen bear, their praise refuse
Till clear by Thee, my faithful eye
Thy perfect will with transport sees,
And strong my arm, to force the sky,
And grasp the crown of righteousness.

Hymnal/Album: Originally titled: “‘Woe to the idol shepherd that leaves the flock: the sword shall be upon his arm, and his right eye: his arm shall be clean dried up, and his right eye shall be utterly darkened.’—[Zech.] 11:17.” This hymn appears in the 1783 manuscript “MS Scriptural Hymns.” This manuscript is part of the collection of the Methodist Archive and Research Centre in The John Rylands Library, The University of Manchester (accession number MA 1977/576, Charles Wesley Notebooks Box 3). Accessed through the website of The Center for Studies in the Wesleyan Tradition, Duke Divinity School. Published in The Poetical Works of John and Charles Wesley, Collected and Arranged by G. Osborn, Vol. 10 (London: Wesleyan-Methodist Conference Office, 1870), page 120.
Publishing: Public Domain