Revelation 2:9 Commentaries
Barnes Notes on the Bible,
"Of them which say they are Jews - Who profess to be Jews. The idea seems to be that though they were of Jewish extraction, and professed to be Jews, they were not true Jews; they indulged in a bitterness of reproach, and a severity of language, which showed that they had not the spirit of the Jewish religion"
Jamieson-Fausset-Brown Bible Commentary,
"say they are Jews, and are not—Jews by national descent, but not spiritually of "the true circumcision."
Cambridge Bible for Schools and Colleges,
which say they are jews] No doubt the persons meant are real Jews by birth as well as by profession, but are denied to be worthy of the name.
Vincent's Word Studies,
Jews
Literally. Not Christians, as in
Philippians 3:3;
Romans 2:28,
Romans 2:29. Actually Jews by birth, but not spiritually. The title is not given them by the Spirit, nor by the seer, but by themselves; and none would use that title except such as were Jews by birth and by religion.