Then they cast lots, and the lot fell to Matthias. So he was added to the eleven apostles.
26. They gave in their lots We will not, in this place, make any long disputation about lots. Those men who think it to be wickedness to cast lots at all, offend partly through ignorance, and partly they understand not the force of this word.
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
And they gave forth their lots,.... Or "gave forth lots for them", as the Vulgate Latin and Ethiopic versions; for Joseph and Matthias; some for one, and some for another; and which were cast into a man's lap, or into a vessel, and was no other than balloting for them; and so he that had the majority upon casting them up, when taken out, was...