About: http://webisa.webdatacommons.org/285716120

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Sets his life aside for knowledge of G-d (He seems to be referring to Torah study here) So it is pretty clear that Rambam is extending the war exemption given to Levi, to anyone who takes on that role, i.e. people devoted to Torah.
http://www.w3.org/ns/prov#wasQuotedFrom	cross-currents.com