This is found in Zacharias in words different; it is said to God in the person of the Prophet, “Smite the shepherd, and the sheep will be scattered abroad.” [Zech 13:7] The good Shepherd is smitten, that He may lay down His life for His sheep, and that of many flocks of divers errors should be made one flock, and one Shepherd.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).