NET
20 Your servant Joab did this so as to change this situation. But my lord has wisdom like that of the angel of God, and knows everything that is happening in the land.”
Darby
20 in order to turn the appearance of the thing has thy servant Joab done this thing; but my lord is wise, according to the wisdom of an angel of God, to know all that is in the earth.
KJV
20 To fetch about this form of speech hath thy servant Joab done this thing: and my lord [is] wise, according to the wisdom of an angel of God, to know all [things] that [are] in the earth.