Now there was a day when the sons of God came to present themselves before the Lord, and Satan came also among them.
There was a day when angels in heaven came to present themselves before Jehovah. This happened twice [Job 1:6; Job 2:1], implying that there are regular days in which angels do this. Worship on the planet heaven as well as on other planets where there is life, is no doubt carried on regularly, as here on earth.
Other activities on the other planets where there is intelligent life, are likely carried on as here also, for we are told in Scripture that the invisible things are understood by those that are visible [Rom. 1:20; Col. 1:15-18; Rev. 4:9-11; Rev. 5:8-13; Rev.19:1-10]. See Spirit Word, Dake: page 632.
First Mention of Satan:
Here we have the first mention, historically speaking, of the arch enemy of God and man, by his name. Not even in Genesis is he mentioned by name – and the time of Job was early in history, for he was the son of Issachar who was the son of Jacob [Gen. 46:13].
It is clear that in Genesis 3 that there was an invisible enemy who caused the fall of man, but in the passage he is shown as using the serpent as a tool, in the same way that he used Peter [Matt. 16:23].
In chapter 41 he is symbolized by a great dragon. He is the evil spirit working in the children of disobedience throughout the ages [Eph. 1:1-3]; here he is named and spoken of as a real person and shown to be one having access to heaven with power to accuse the brethren and seek their destruction [Rev. 12:9-12].
The word Satan means adversary. [see note k, 1 Kings 11:14 and Satan, p. 633: Dake]
– Dake Annotated Reference Bible: page 424