Stretch out … and strike all he has … Everything he has is in your hands: Satan was God's agent. The hand he used was both the Lord's and Satan's. They acted against everything Job owned and later against Job himself (2:5–6).
Job later cursed the day of his birth, but he did not curse God (3:1, 8; 31:30). This was even true when his upset wife urged him to do so (2:9).
God allowed Satan to test Job to show that Satan's negative view of Job was wrong (1 Corinthians 10:11; see James 1:13; compare Luke 22:31–32; John 19:11).