Titus of Bostra — as excerpted in the Catena Aurea on Luke 17:11-19

“They associated together from the sympathy they felt as partakers of the same calamity, and were waiting till Jesus passed, anxiously looking out to see Him approach. As it is said, Which stood afar off, for the Jewish law esteems leprosy unclean, whereas the law of the Gospel calls unclean not the outward, but the inward leprosy.”