Charles Ellicott Commentary Luke 21:18

"And not a hair of your head shall perish." — Luke 21:18 (ASV)

There shall not an hair of your head perish.—The promise does not meet us in this form in the parallel passages of the two other Gospels. A like promise meets us in Matthew 10:30, Luke 12:7. The very same phrase occurs, however, almost as if it were a quotation from this Gospel, in St. Paul’s address to the sailors, in Acts 27:34.