Take the sum. For the order of the tribes see App-45. Moses received them by number, Exodus 38:26. so now, when preparing to die, he delivers them over by number. This was the third numbering.
children. sons.
their fathers' house: i.e. the families. These shown here to be fortyseven. In Genesis 46 they are fifty-two; so five are extinct (one of Simeon, one of Asher, and three of Benjamin).