Go to the "source section" below to see why I wrote this.
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Satan was allowed into heaven even after his rebellion. The Bible suggests he was allowed into heaven until 1914 AD, when Jesus became King over God's Kingdom in heaven. Satan is then kicked out of heaven permanently.
Satan was allowed in heaven until that time. He is no longer allowed, and hasn't been since 1914 AD. Why 1914?
Luke 21:24--and they will fall by the edge of the sword and be led captive into all the nations; and Jerusalem will be trampled on by the nations, until the appointed times of the nations are fulfilled.
Jerusalem was once the capital city of Israel, where the line of rulers from the House of David ruled from as God's representatives. When did Jerusalem begin to be "trampled on by the nations"? That occurred in 607 BC, when Jerusalem was conquered by the Babylonians and the line of Davidic Kings was interrupted. Was this interruption forever?
No. The prophet Ezekiel wrote about the last King of Judah--Zedekiah, at Ezekiel 21:26-27.
Ezekiel 21:26-27--this is what the Sovereign Lord Jehovah has said, ‘Remove the turban, and lift off the crown. This will not be the same. Put on high even what is low, and bring low even the high one. 27) A ruin, a ruin, a ruin I shall make it. As for this also, it will certainly become no [one’s] until he comes who has the legal right, and I must give [it] to him.’
Who had the legal right to the crown of the Davidic King? That would be Jesus, the inheritor of the rulership of God's Kingdom. But when?
Well, in Daniel, the Babylonian King Nebuchadnezzar has a dream in which he dreamed that a large tree was chopped down, and the leftover stump could not grow because it was banded with iron and copper. And "seven times" were to pass over it, according to--
Daniel 4:15-16--However, LEAVE its rootstock itself in the earth, even with a banding of iron and of copper, among the grass of the field; and with the dew of the heavens let it be wet, and with the beast let its portion be among the vegetation of the earth. 16 Let its heart be changed from that of mankind, and let the heart of a beast be given to it, and let seven times pass over it.
According to the revelation of the dream that God gave to Daniel, that tree represents the lack of any rulers over God's Kingdom, which will last for "seven times."
How long is 7 times? Well, the Bible gives a clue in Revelation.
Revelation 12:6--And the woman fled into the wilderness, where she has a place prepared by God, that they should feed her there a thousand two hundred and sixty days.
Revelation 12:14--But the two wings of the great eagle were given the woman, that she might fly into the wilderness to her place; there is where she is fed for a time and times and half a time away from the face of the serpent.
The "woman" here represents God's collective followers on Earth. But the important part of the scriptures for our discussion is that the second verse says that she will be fed for "a time and times and half a time," which basically translates to three and half times. And the first scripture shows that equals 1,260 days. So 7 times being twice 3 and 1/2 times would equal twice 1,260 days, or 2,520 days.
So 2,520 days after the fall of Jerusalem, or 607 BC, would be when Jesus would take over rule of God's Kingdom. However, 2,520 days after the fall of Jerusalem, nothing happened.
Did the prophecy fail? No. The Bible sometimes refers to years by days, as exemplified in--
Ezekiel 4:6--And you must complete them.
“And you must lie upon your right side in the second case, and you must carry the error of the house of Judah forty days. A day for a year, a day for a year, is what I have given you.
Do you see? A day for a year.
So 7 times might refer to 2,520 YEARS. If you add 607 years (the time from 607 BC to 1 AD), and then add 1913 (the difference between 2,520 years and 607 years, since we have already counted 607 years), it comes to the year 1913 AD. But I said 1914 AD. Why?
Well, the Roman calendar that we use does not actually have a year 0, because the Romans did not have a number 0 in their number system. That means we have to add one more year to our count, to make up for that discrepancy in the year.
So the actual count from the fall of Jerusalem to seven times comes to 1914 AD. And what happened in 1914 AD?
World War I. World War I, the first war to incorporate nearly the entire world, to affect so many the world over even if their respective countries were not at war, the first war in which one of the main objectives of all militaries involved was to inflict suffering on the civilians of the opposing countries...that occurred in 1914 AD. Right when it says that "the devil has come down to you, having great wrath, because he knows that he has a short time." In 1914, Jesus was installed as King of God's Kingdom, and Satan was cast out of heaven for all time.