Acts 1:17

For he was numbered with us
He was chosen an apostle with: the rest, and was ordained into that office when they were, and was always reckoned one of the twelve, and stands in the catalogue when they are mentioned:

and had obtained part of this ministry;
by lot, as the word signifies; the providence of God so ordering it, according to his eternal purpose and decree, that he was not only called an apostle, and enrolled among them, but he really had a part in that ministry; he preached, and baptized, and wrought miracles; and besides all this, carried the bag, was the treasurer, and a sort of a steward in Christ's family, and provided for it.