And Moses, by the commandment of the Lord
 By his power, permission, and leave, as Jarchi, that there might be no delay through his means: 
 sent them from the wilderness of Paran;
 from Rithmah or Kadeshbarnea, which seem to be one and the same place in that wilderness: this, as before observed, was on the twenty ninth day of Sivan: (See Gill on Numbers 13:1); 
 all those [were] heads of the children of Israel;
 were not mean and vulgar men, but persons of rule, who bore some office of magistracy ant government among the people in their respective tribes.