John Gill Commentary 1 Chronicles 21:3

"And Joab said, Jehovah make his people a hundred times as many as they are: but, my lord the king, are they not all my lord`s servants? why doth my lord require this thing? why will he be a cause of guilt unto Israel?" — 1 Chronicles 21:3 (ASV)

(See Gill on 1 Chronicles 21:1).