If he shrink back (εαν υποστειλητα). Condition of third class with εαν and the first aorist middle subjunctive of υποστελλω, old verb to draw oneself under or back, to withdraw, as already in Acts 20:20; Acts 20:27; Galatians 2:12. See Romans 1:17 for the quotation also of "the just shall live by faith."