Jer 50:6

“He said the sheep is like one who has gone astray. And also in the Gospel he said, "The Son of man came to search for and save the lost." And also in the parable only one is lost out of the hundred that the shepherd who dwelled with them came to find, who also, after laying it on his shoulders, returned it to the ninety-nine. For we are all one body and one sheep. He who is the feet and the head and the rest is the shepherd who, after he came, brought together bone with bone and joint with joint, and after he united them, he took them up to his country. And the unity arises through love and truth and the choice of good. Thus to his own Word he united all. But if some who are disobedient have appeared, they have acquired an incurable condition. Thus every Israelite is one according to the true relationship. For we are all one body and one loaf of bread, and we partake of one spirit. But a sheep that goes astray is one who in word and practice does not join the hunt of what is proper, either by not seeking or by not finding. And the one who knows and does what concerns knowledge does not go astray. But the one who goes astray is driven out by lions. For your adversary the devil prowls around like a roaring lion, seeking someone to devour. And also already young lions roaring to seize and seek from God food for themselves lay snares for the righteous.”

“Then he likens them to lost sheep. He ascribes the cause for the destruction of the sheep to the shepherds. He calls "shepherds" not only their kings but also their priests. And he saw how they prepared them to wander: "They drove them to the mountains and made them wander; they have gone from mountain to hill and have forgotten their fold." He calls the shrines of the idols "hills" and "mountains" for in them they worshiped the idols. And he calls the temple of God a "fold" because they had there the enjoyment of good things. This wandering handed them over to the enemy inasmuch as they sinned against the Lord.”