And He gave some as apostles, and some as prophets, and some as evangelists, and some as pastors and teachers, for the perfecting of the saints for the work of ministry, for the building up of the body of Christ, until we all arrive to the unity of the faith and of the knowledge of the Son of God, to a mature man, to the measure of the stature of the fullness of Christ;
(Eph 4:11-13 EMTV)
Eph 4:13 Till we all come in the unity of the faith,....
These words regard the continuance of the Gospel ministry in the church, until all the elect of God come in: or "to the unity of the faith"; by which is meant, not the union between the saints, the cement of which is love; nor that which is between Christ and his people, of which his love, and not their faith, is the bond; but the same with the "one faith", Eph_4:5 and designs either the doctrine of faith, which is uniform, and all of a piece; and the sense is, that the ministration of the Gospel will continue until the saints entirely unite in their sentiments about it, and both watchmen and churches see eye to eye: or else the grace of faith, which as to its nature, object, author, spring, and cause, is the same; and it usually comes by hearing; and all God's elect shall have it; and the work and office of the ministry will remain until they are all brought to believe in Christ;
-John Gill
Eph 4:13
In the unity of the faith -
Jews and Gentiles being all converted according to the doctrines laid down in the faith - the Christian system.
-Adam Clarke