Psalms 77:72

37. “And He took him from the flocks of sheep, from behind the teeming sheep He received him: to feed Jacob His servant, and Israel His inheritance” ( ver. 72 ). This David indeed, of whose seed the flesh of Christ is, from the pastoral care of cattle was translated to the kingdom of men: but our David, Jesus Himself, from men to men, from Jews to Gentiles, was yet according to the parable from sheep to sheep taken away and translated. For there are not now in that land “Churches of Judæa in Christ,” which belonged to them of the circumcision after the recent Passion and Resurrection of our Lord, of whom saith the Apostle, “But I was unknown by face to the Churches of Judæa, which are in Christ,” etc. Already from hence those Churches of the circumcised people have passed away: and thus in Judæa, which now doth exist on the earth, there is not now Christ. …

2. Now, why, my beloved, did these pastors first feed the sheep, and were then chosen to be pastors of men? Clearly that they might learn how a pastor cares for his sheep, and is watchful and toils in behalf of his sheep. And when they had learned the manners of pastors, they were chosen for the pastoral office. Jacob fed the sheep of Laban and toiled and was vigilant and led them well; and then he tended and guided well his sons, and taught them the pattern of pastoral work. And Joseph used to tend the sheep along with his brethren; and in Egypt he became guide to a numerous people, and led them back, as a good pastor does his flock. Moses fed the sheep of Jethro his father-in-law, and he was chosen from (tending) the sheep to tend his people, and as a good pastor he guided them. …

5. And remember, my beloved, that I wrote to thee concerning our fathers of old that they first learned the ways of tending sheep and in that received trial of carefulness, and then were chosen for the office of guides, that they might learn and observe how much the pastor cares for his flock, and as they used to guide the sheep carefully, so also might be perfected in this office of guidance. Thus Joseph was chosen from the sheep, to guide the Egyptians in the time of affliction. And Moses was chosen from the sheep, to guide his people and tend them. And David was taken from following the sheep, to become king over Israel. And the Lord took Amos from following the sheep, and made him a prophet over his people. Elisha likewise was taken from behind the yoke, to become a prophet in Israel. Moses did not return to his sheep, nor did he leave his flock that was committed to him. …