1 Chronicles 21:3
And Joab answered, The Lord make his people an hundred times so many more as they be: but, my lord the king, are they not all my lord’s servants? why then doth my lord require this thing? why will he be a cause of trespass to Israel? (1 Chronicles 21:3)
Cause of trespass.
 In Samuel, Joab’s protestation is reported thus: “Why doth my lord the king delight in this thing?” (2 Sam. 24:3). In his remonstrance with the king, Joab was endeavoring by a series of questions to cause David to see the folly of his course and the evil it would bring.
Joab answered.
Hardened warrior though he was, Joab saw no light in David’s attempt to number Israel, and registered his protest against the plan.