Numbers 1:8, 28-30

from [the tribe of] Issachar, Nethanel the son of Zuar

Of the sons of Issachar, their descendants, by their families (clans), by their fathers’ households, according to the number of names, from twenty years old and upward, all who were able to go to war: those of the tribe of Issachar numbered 54,400. Of the sons of Zebulun, their descendants, by their families (clans), by their fathers’ households, according to the number of names, from twenty years old and upward, all who were able to go to war