Mark them By this expression he means, that it is all one to him what persons they single out for themselves for imitation, provided they conform themselves to that purity of which he was a pattern. By this means all suspicion of ambition is taken away, for the man that is devoted to his own interests wishes to have no rival. At the same time he warns them that all are not to be imitated indiscriminately, as he afterwards explains more fully.

Brethren, be followers together of me - That is, live as I do. A minister of the gospel, a parent, or a Christian of any age or condition, ought so to live that he can refer to his own example, and exhort others to imitate the course of life which he had led. Paul could do this without ostentation or impropriety. They knew that he lived so as to be a proper example for others; and he knew that they would feel that his life had been such that there would be no impropriety in his referring to it in this manner. But, alas, how few are there who can safely imitate Paul in this!
And mark them which walk so, as ye have us for an ensample - There were those in the church who endeavored to live as he had done, renouncing all confidence in the flesh, and aiming to win the prize. There were others, it would seem, who were actuated by different views; see Philippians 3:18. There are usually two kinds of professing Christians in every church - those who imitate the Saviour, and those who are worldly and vain. The exhortation here is, to "mark" - that is, to observe with a view to imitate - those who lived as the apostles did. We should set before our minds the best examples, and endeavor to imitate the most holy people. A worldly and fashionable professor of religion is a very bad example to follow; and especially young Christians should set before their minds for imitation, and associate with, the purest and most spiritual members of the church. Our religion takes its form and complexion much from those with whom we associate; and he will usually be the most holy man who associates with the most holy companions.

Brethren, be followers - of me - In the things of Christ let me be your line, and my writings preaching, and conduct, your rule.
And mark them - Σκοπειτε. Still alluding to the line in the stadium, keep your eye steadily fixed on those who walk - live, as ye have us - myself, Timothy, and Epaphroditus, for an ensample.

Brethren, be followers together of me,.... Not that the apostle set up himself as the head of a party, which is what he always blamed in others; he did not assume a dominion over the faith of men, or seek to lord it over God's heritage; nor did he desire any to be followers of him, any further than he was a follower of Christ; and in what he was, whether in doctrine or practice, he desires to be followed in: and here he has a particular regard to what went before, concerning reckoning what was gain loss; accounting all things but dung, in comparison of the knowledge of Christ, looking to his righteousness alone for justification, Philippians 3:9; disclaiming perfection, yet forgetting things behind; reaching towards things before, and pressing to the mark for the prize, Philippians 3:13; and walking according to the rule of God's word; in which things he had some that followed him, who were his spiritual children, and to whom he had been useful in conversion and edification; see 1-Corinthians 4:15; and he would therefore have these Philippians followers of him, "together" with them; and which contains in it an encouraging reason, or argument, since others were followers of him; or together with one another, he was desirous, that one and all of them might follow him; that they might all go in the same way, profess the same truth, be found in the practice of the same things, worship the Lord with one consent, pursue the same ends, and draw all the same way; and so be as the church was, like a company of horses in Pharaoh's chariot, Song 1:9,
and mark them which walk so; as the apostle did, and those that were followers of him; these he would have them mark, observe, attentively look to; not as others, who cause offences and divisions, and obey not the word, in order to shun, avoid, and keep no company with; but to imitate and follow, and next to Christ, the mark, to make use of them as inferior ones:
as ye have us for an ensample, or "type"; believers should be ensamples one to another, especially ministers of the word; pastors of churches are not to be lords over God's heritage, but to be ensamples to the flock, 1-Peter 5:3, in word, in conversation, in charity, in spirit; in faith, in purity, as the apostle exhorts Timothy, 1-Timothy 4:12, and in these things they are to be followed by believers.

followers--Greek, "imitators together."
of me--as I am an imitator of Christ (1-Corinthians 11:1): Imitate me no farther than as I imitate Christ. Or as BENGEL "My fellow imitators of God" or "Christ"; "imitators of Christ together with me" (see on Philippians 2:22; Ephesians 5:1).
mark--for imitation.
which walk so as ye have us for an ensample--In English Version of the former clause, the translation of this clause is, "those who are walking so as ye have an example in us." But in BENGEL'S translation, "inasmuch as," or "since," instead of "as."

Be followers of me. Compare 1-Corinthians 4:16; 1-Corinthians 11:1.
Mark them which walk so. Not only follow my example, but note those who do not follow it.
For many walk. There is a class who walk far otherwise, who cause him great sorrow.
Of whom I have told you often. Probably, when he was preaching at Philippi, or visiting there (2-Corinthians 2:13). This class had come into the church, but had not left off their pagan vices.
Now tell you weeping. Because of the evil such offenders do.
Enemies. Such persons are the worst enemies of Christ. One church member who arouses a scandal can wound the cause of Christ more than a dozen scoffers.
Whose end is destruction. Their final fate must be eternal ruin (2-Peter 2:3).
Whose God is their belly. They obey their sensual appetites.
Whose glory, etc. They glory in shameful things.
Mind earthly things. Instead of setting their affections on the things that are above (Colossians 3:1).
For our conversation is in heaven. Our citizenship. See Revision. We are citizens of heaven itself, our country, from which we are now absent, and which we are seeking. Hence we ought to mind heavenly things. There our Lord dwells, and from thence he will come.
Who shall change our vile body. Our lowly body shall undergo a change to fit it for heaven. It will take the form of his glorified body, such as was seen at the Transfiguration. Compare 1-Corinthians 15:43-52; 2-Corinthians 5:1-4; 1-John 3:2.
According to the working. This change shall be effected in harmony with that mighty power which shall subdue all things to his sway.

Mark them - For your imitation.