1Again, on the day when God’s sons came to present themselves before Yahweh, Satan came also among them to present himself before Yahweh. 2Yahweh said to Satan, “Where have you come from?”
Satan answered Yahweh, and said, “From going back and forth in the earth, and from walking up and down in it.”
3Yahweh said to Satan, “Have you considered my servant Job? For there is no one like him in the earth, a blameless and an upright man, one who fears God, and turns away from evil. He still maintains his integrity, although you incited me against him, to ruin him without cause.”
4Satan answered Yahweh, and said, “Skin for skin. Yes, all that a man has he will give for his life. 5But stretch out your hand now, and touch his bone and his flesh, and he will renounce you to your face.”
6Yahweh said to Satan, “Behold, he is in your hand. Only spare his life.”
7So Satan went out from the presence of Yahweh, and struck Job with painful sores from the sole of his foot to his head. 8He took for himself a potsherd to scrape himself with, and he sat among the ashes. 9Then his wife said to him, “Do you still maintain your integrity? Renounce God, and die.”
10But he said to her, “You speak as one of the foolish women would speak. What? Shall we receive good at the hand of God, and shall we not receive evil?”
In all this Job didn’t sin with his lips. 11Now when Job’s three friends heard of all this evil that had come on him, they each came from his own place: Eliphaz the Temanite, Bildad the Shuhite, and Zophar the Naamathite; and they made an appointment together to come to sympathize with him and to comfort him. 12When they lifted up their eyes from a distance, and didn’t recognize him, they raised their voices, and wept; and they each tore his robe, and sprinkled dust on their heads toward the sky. 13So they sat down with him on the ground seven days and seven nights, and no one spoke a word to him, for they saw that his grief was very great.
The war in heaven between Michael and his angels and Satan (dragon) and his angels resulted in Satan’s defeat and his being cast to the earth with his angels. This is when Satan is finally cast out of heaven. He is there now, accusing us before God day and night (verse 10). We see this also in Job when Satan challenged God (Job 1:6-12; 2:1-7). This passage identifies demons as angels fighting for Satan, who fell with Satan in his rebellion. The reference to fighting in heaven likely looks at heaven itself, or at least the spiritual, as well as the special place that heaven occupies.
The defeat is described as the banishment of Satan and his angels from heaven and their being “thrown” to earth. This is not looking at the war that occurred before the world was created, but a final battle that will be fought during the Tribulation. This indicates that Satan and his demons presently have some kind of access to heaven. Job indicates that they must “report in” every so often, as God continues to exercise His sovereign control of them even in their rebellion.