'Apostles' in the Bible

As for Titus, he is my partner and fellow worker for you. As for our brothers, they are the apostles of the assemblies, the glory of Christ.

For I reckon that I am not at all behind the very best apostles.

For such men are false apostles, deceitful workers, masquerading as Christ's apostles.

I have become foolish in boasting. You compelled me, for I ought to have been commended by you, for in nothing was I inferior to the very best apostles, though I am nothing.