Joab said, Yahweh make his people a hundred times as many as they are: but, my lord the king, aren't they all my lord's servants? why does my lord require this thing? why will he be a cause of guilt to Israel?
"The major reason for taking a census in Israel was to lay the basis for levying taxes (Exodus 30:12; Numbers 3:40-51) or registering men for military service (Numbers 26:1-4)." [Note: Thompson, p. 160. Cf. 21:4-7.] 