Acts 1:21

Peter announces to them, so that the matter may not become a subject of bitter contest, and that they may not fall into quarreling. For this reason he also begins, "Men, brothers," he says, "it is necessary to choose from among you, entrusting the decision …

"Wherefore it behooves of these men which have companied with us all the time." Why does he make it their business too? That the matter might not become an object of strife, and they might not fall into contention about it. For if the Apostles themselves once did this, much more might those. This he ever avoids. Wherefore at the beginning he said, "Men and brethren. It behooves" to choose from among you. He defers the decision to the whole body, thereby both making the elected objects of reverence and himself keeping clear of all invidiousness with regard to the rest. For such occasions always give rise to great evils. Now that some one must needs be appointed, he adduces the prophet as witness: but from among what persons: "Of these," he says, "which have companied with us, all the time that the Lord Jesus went in and out among us, beginning from the baptism of John unto that same day that He was taken up from us, must one be ordained to be a witness with us of His resurrection": that their college might not be left mutilated. Then why did it not rest with Peter to make the election himself: what was the motive? This; that he might not seem to bestow it of favor. And besides, he was not yet endowed with the spirit. "Wherefore of these men which have companied with us," continues Peter. Observe how desirous he is they should be eye-witnesses. It is true indeed that the Spirit would shortly come; and yet great care is shown with regard to this circumstance. "Of these men," he says, "which have companied with us, all the time that the Lord Jesus went in and out among us." He shows that they had dwelt with Christ, not simply been present as disciples. In fact, from the very beginning there were many that then followed Him. "All the time," he says, "that the Lord Jesus went in and out among us, beginning from the baptism of John." True! […]

Wherefore of these men which have companied with us,....

Theophilus is put in mind, and we in him, of St. Luke's gospel, which it will be of use for us to cast an eye upon before we enter upon the study of this book, that we may not only see how this begins where that breaks off, but that, as in water face answers to face, so do the acts of the apostles to the acts of their Master, the acts of his grace.

Wherefore of these men - Of those who had witnessed the life and works of Christ, and who were therefore qualified to discharge the duties of the office from which Judas fell. Probably Peter refers to the seventy disciples, Luk 10:1-2. Went in and out - A phrase signifying that he was their constant companion. It expresses in general all the actions of the life, Psa 121:8; Deu 28:19; Deu 31:2.