Verses 21, 22. 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, Lu 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, Ps 121:8; De 28:19; 31:2.

Beginning from the baptism of John. The words "beginning from," in the original, refer to the Lord Jesus. The meaning may be thus expressed: "During all the time in which the Lord Jesus, beginning (his ministry) at the time when he was baptized by John, went in and out among us, until the time when he was taken up," etc. From those who had during that time been the constant companions of the Lord Jesus must one be taken, who would thus be a witness of his whole ministry.

Must one be ordained. It is fit or proper that one should be ordained. The reason of this was, that Jesus had originally chosen the number twelve for this work, and as one of them had fallen, it was proper that the breach should be filled by some person equally qualified for the office, The reason why it was proper that he should be taken from the seventy disciples was, that they had been particularly distinguished by Jesus himself, and commanded to preach, and endowed with various powers, and had been witnesses of most of his public life, Lu 10:1-16. The word ordained, with us, has a fixed and definite meaning. It denotes to set apart to a sacred office with the proper form and solemnities, commonly by the imposition of hands. But this is not, of necessity, the meaning of this passage. The Greek word usually denoting ordination is not used here. The expression is, literally, must one be, or become -- genesyai -- a witness with us of his resurrection." The expression does not imply that he must be set apart in any particular manner, but simply that one should be designated, or appointed for this specific purpose, to be a witness of the resurrection of Christ.

{e} "of these men" Lu 10:1,2; Joh 15:27