Acts 20:28

Take heed therefore unto yourselves
Since the blood of men may be required of those, who are negligent or partial in their office, and shun to declare the whole counsel of God: this exhortation is given them not merely as men, to take care of their bodily health, the outward concerns of life, and provide for themselves and families; nor merely as Christians, but as ministers of the Gospel; that they would take heed to their gifts, to use and improve them, and not neglect them; to their time, that they spend it aright, and not squander it away; and to their spirit, temper, and passions, that they are not governed by them; and to their lives and conversations, that they be exemplary to those who are under their care; and to their doctrine, that it be according to the Scriptures; that it be the doctrine of Christ, and the same with the apostles; that it be according to godliness, and that it tends to edification; that it be sound and incorrupt, pure and unmixed, and all of a piece and consistent with itself; and that they be not infected and carried away with errors and heresies:

and to all the flock;
the church and all the members of it, which are compared to a flock of sheep, which are to be looked after and watched over by the ministers of the word, who are as shepherds to them, lest they should be infected, or any damage done them. The people of God are compared to sheep on many accounts; before conversion, for their going astray, when they are as lost sheep; after conversion, for their meek and inoffensive carriage and behaviour, and for their patience in bearing sufferings, to which they are exposed: and a church of Christ is compared to a flock of them, being in Gospel order, folded together and feeding in the same pasture, attending the word and ordinances, under the care of shepherds appointed by Christ the chief shepherd; whose business it is to take heed unto them, and care of them, to learn to know their state and condition, to watch over them, and to feed them with knowledge and with understanding, for which they are qualified by Christ; and they are to take heed unto everyone in the flock, the poor of the flock as well as others, the lambs as well as the sheep, and the sick and the diseased, the torn, and straying, and driven away, as well as the fat and the strong: and this flock, though a little flock, is a holy and beautiful one, a flock of men, and of the souls of men dear to God, to Christ and the blessed Spirit; and a special regard should be had unto them, and that for reasons following:

over which the Holy Ghost hath made you overseers;
or "bishops"; this is said to the elders of the church, ( Acts 20:17 ) which shows that the office of an elder and a bishop is one and the same office; and this contains in it more than one argument why they should take heed to the flock; as because they are the overseers of it, who have the care and oversight of the flock, that is under their inspection, and is their proper province, and office; and this they were put into by the Holy Ghost, who gave them gifts to qualify them for it, and called, and inclined them to undertake it, as well as moved the people to make choice of them for this purpose; and since, therefore, this was an affair in which the Holy Ghost was so much concerned, it became them very diligently to attend it:

to feed the church of God;
with knowledge and understanding; and discharge the whole office of faithful shepherds to the flock, by feeding the flock and not themselves, strengthening the diseased, healing the sick, binding up the broken, bringing again that which was driven away, and seeking up that which was lost: and here is another argument suggested, to stir up to a diligent performance of this work; and that is, that this flock is the church of God, a set of men whom God has chosen for himself, and called by his grace out of the world, and separated for his own use and glory, and among whom he dwells; and therefore to be fed with the faithful word, with the finest of the wheat, and not with the chaff of human schemes, and with the wind of false doctrine, nor with anything that is vain, trifling, and deceitful; but with the solid doctrines of the Gospel, with the words of faith and good doctrine, with the wholesome words of Christ Jesus, which have in them milk for babes and meat for strong men, and with and by the ordinances of the Gospel, which are the green pastures they are to be guided into, and abide in; and in all they are to be directed to Christ, the sum of the word and ordinances, who is the bread of life, and food of faith; and that the church should be thus fed, is the will of Christ, who has appointed and ordered his ministers to feed his lambs and sheep, and has furnished them with what is necessary for this work; this is the design of the ministry of the Gospel, and the administration of ordinances; and the churches of Christ are placed where food may be had, where the word is faithfully preached, and the ordinances truly administered: some copies read, "the church of the Lord"; and others, and so the Complutensian edition, "the church of the Lord and God":

which he hath purchased with his own blood;
which being the blood not only of a pure and innocent man, but of one that is truly and properly God as well as man, was a sufficient ransom price to redeem the church and people of God from sin, the law, its curse and condemnation: so that this is no inconsiderable proof of the true and proper deity of Christ; and contains a fresh argument, or reason, why the flock of God and "church of Christ", as the Syriac version reads; or "the church of the Lord and God", as in five of Beza's exemplars: or "of the Lord God", as the Arabic version, should be taken heed unto and fed; because it must needs be dear to God and Christ, and precious to them, since so great a price has been paid for it. The purchaser is God, Christ who is God over all, blessed for ever, not a creature; that could never have made such a purchase, it could not have purchased a single sheep or lamb in this flock, no man can redeem his brother, or give to God a ransom for him, much less the whole flock; but Christ being God, was able to make such a purchase, and he has actually made it, and given a sufficient price for it; not to Satan, with whom these sheep were a prey, and from whom they are taken in virtue of the ransom given; but to God, from whom they strayed, against whom they sinned, and whose law they broke; and this price was not silver and gold, nor men, nor people: but Christ himself, his life and blood; and which were his "own", the human nature, the blood of which was shed, and its life given being in union with his divine person, and was in such sense his own, the property of the Son of God, as the life and blood of no mere man are theirs: and this purchase now being made in this way, and by such means, is a very proper one; it is not made without price, but with an invaluable one; and it is a legal purchase, a valuable consideration being given for it, perfectly equivalent to it; and therefore is a complete one, there is nothing wanting to make it more firm, it is a finished purchase; and it is a very peculiar one, it is a peculiar people that are purchased, called the purchased possession, ( Ephesians 1:14 ) and a peculiar price which is paid for it; there is no other of the same kind, nor any thing like it, and it is made by a peculiar person, one that is God and man in one person.