Charles Ellicott Commentary Titus 1:10

"For there are many unruly men, vain talkers and deceivers, specially they of the circumcision," — Titus 1:10 (ASV)

For there are many unruly and vain talkers and deceivers—nominally in the congregations of Christians, but in reality refusing all obedience, acting for themselves, factious, and insubordinate. Titus would, unfortunately, discover many such people; these would often be found to possess the gift of fluent and deceptive speech and would deceive many. Professor Reynolds characterises such restless, uneasy spirits as loquacious, restless talkers, “who must say something, and who have broken the peace of many a home and shattered the prosperity of many a church; the multitude of teachers who have nothing true to say is the curse of the kingdom of God.”

Specially they of the circumcision—here St. Paul points out to Titus where he must look for the origin of this hostility. These unhappy men evidently did not belong to the stern and rigid Jewish party who hated with a bitter hate all the followers of the Nazarene, but were of the number of those sleepless opponents of St. Paul and his school—the Judaising Christians.