GOD'S WORD® Translation
Joab responded, "May the LORD multiply his people a hundred times over. But, Your Majesty, aren't they all your servants? Why are you trying to do this? Why do you wish to make Israel guilty of [this] sin?"

American Standard Version
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?

Berean Study Bible
But Joab replied, “May the LORD multiply His troops a hundred times over. My lord the king, are they not all servants of my lord? Why does my lord want to do this? Why should he bring guilt on Israel?”

Douay-Rheims Bible
And Joab answered: The Lord make his people a hundred times more than they are : but, my lord the king, are they not all thy servants: why doth my lord seek this thing, which may be imputed as a sin to Israel?

English Revised Version
And Joab said, 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 doth my lord require this thing? why will he be a cause of guilt unto Israel?

King James Bible
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?

World English Bible
Joab said, "May 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?"

Young's Literal Translation
And Joab saith, 'Jehovah doth add to His people as they are a hundred times; are they not, my lord, O king, all of them to my lord for servants? why doth my lord seek this? why is he for a cause of guilt to Israel?'

1 Chronicles 21:3 Additional Translations ...