A.T. Robertson Commentary 2 Corinthians 8:23

"Whether [any inquire] about Titus, [he is] my partner and [my] fellow-worker to you-ward, or our brethren, [they are] the messengers of the churches, [they are] the glory of Christ." — 2 Corinthians 8:23 (ASV)

About Titus (υπερ Τιτου). There is no verb expressed. Supply "inquire." He endorses Titus up to the hilt. He is "my partner" (κοινωνος εμος) and "fellow-worker" (συνεργος).

Messengers of the churches (αποστολο εκκλησιων). Apostles in the general sense of "sent ones" (from αποστελλω, to send) by the churches and responsible to the churches for the handling of the funds.

The glory of Christ (δοξα Χριστου). Financial agents, please observe.