Luke
Acts 1:21ESV·traditional attribution

So one of the men who have accompanied us during all the time that the Lord Jesus went in and out among us,

John Calvin Reformed @genevareformer

21. We must therefore. This which he bringeth in might seem, at the first sight, to be far set [fetched.] For if so be it David did speak of transposing “Transferendo,” transferring. Judas’s bishopric, it did not thereupon straightway follow that the disciples should choose another to be his successor; yet, because they knew that they had this charge given them to order the Church...

Matthew Henry Presbyterian @wholebiblehenry

The sin of Judas was not only his shame and ruin, but it made a vacancy in the college of the apostles. They were ordained twelve, with an eye to the twelve tribes of Israel, descended from the twelve patriarchs; they were the twelve stars that make up the church's crown (Rev 12:1), and for them twelve thrones were designated, Mat 19:28.

Commenting on Acts 1:15-26

John Gill Reformed Baptist @doctorgill

Wherefore of these men which have companied with us,.... Seeing there was such an imprecation, which carried in it the nature of a prophecy, that another should take the bishopric of Judas, or be made an apostle in his room, it was absolutely necessary that one should be immediately chosen to that office; and this is the force of the illative particle, wherefore; and it...