Help needed: ‘work, live, fight, die for the republic’

Years ago I think I read a definition of civic virtue as ‘the willingness to work, live, fight and if necessary die for the republic’. But I can’t find the source of this quotation. I thought it was in Bernard Crick’s introduction to his edition of the Discourses, but I can’t find it there. Searching on Google hasn’t thrown up the answer either.

Does anyone know the source?