Commentaries:
Robertson's Word Pictures (NT)
Not a hair of your head shall perish (qric ek thv kefalhv umwn ou mh apolhtai). Only in Luke. Second aorist middle subjunctive of apollumi with ou mh (double negative). Jesus has just said that some they will put to death. Hence it is spiritual safety here promised such as Paul claimed about death in Philippians 1:21.
Other Robertson's Word Pictures (NT) entries containing Luke 21:17:
John 15:21
Acts 4:11
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