Appears 394 times (352 Old Testament) in the KJV and most of the time it refers to amount of Money, men in army, people who died, people in a tribe, animals, cubits, chariots, number of angles for example.
The New Testament has 42 occurrences of thousand.
Two unique occurrences are found in the Book of Psalm:
Psalm 84:10 For a day in thy courts is better than a thousand. I had rather be a doorkeeper in the house of my God, than to dwell in the tents of wickedness.
Psalm 90:4 For a thousand years in thy sight are but as yesterday when it is past, and as a watch in the night.
Peter, in his 2nd epistle, to Jewish believers, he reminds them of Psalm 90:4.
2 Peter 3:8 But, beloved, be not ignorant of this one thing, that one day is with the Lord as a thousand years, and a thousand years as one day.
John has 20 references in Revelation:
These verses are only where “thousand” is mentioned. The first reference: he tells of the number of angels in heaven:
Revelation 5:11 And I beheld, and I heard the voice of many angels round about the throne and the beasts and the elders: and the number of them was ten thousand times ten thousand, and thousands of thousands;
The remainder of the references occur during the Tribulation (7 years) and into the millilumen (1000 years). He reports on the number of Jewish young men who will preach the kingdom of God during the Tribulation:
Revelation 7:4-8 And I heard the number of them which were sealed:
He then names each tribe and 12,000 from each one = 144,000.
Then the size of an army released during the 6th trumpet:
Revelation 9:16 And the number of the army of the horsemen were two hundred thousand thousand: and I heard the number of them.
He then gives the number of days the two witnesses who will have power to on earth (3 1/2 years):
Revelation 11:3 And I will give power unto my two witnesses, and they shall prophesy a thousand two hundred and threescore days, clothed in sackcloth.
Continuing with the destruction and tragedy during Tribulation.
Revelation 11:13 And the same hour was there a great earthquake, and the tenth part of the city fell, and in the earthquake were slain of men seven thousand: and the remnant were affrighted, and gave glory to the God of heaven.
Another mention of time, 3.5 years. The length of time Israel will hide from the Antichrist, while God protects her:
Revelation 12:6 And the woman fled into the wilderness, where she hath a place prepared of God, that they should feed her there a thousand two hundred and threescore days.
Another reference to the young Jewish men who will Preach the Gospel of the Kingdom during the Tribulation:
Revelation 14:1 And I looked, and, lo, a Lamb stood on the mount Sion, and with him an hundred forty and four thousand, having his Father’s name written …
Revelation 14:3 And they sung as it were a new song before the throne, and before the four beasts, and the elders: and no man could learn that song but the hundred and forty and four thousand, which were redeemed from the earth.
Just think, blood 4-5 feet deep (in the valley of Megiddo:
Revelation 14:20 And the winepress was trodden without the city, and blood came out of the winepress, even unto the horse bridles, by the space of a thousand and six hundred furlongs.
Events at the end of Tribulation and the tart of millilumen (God’s kingdom reign on earth) Revelation 20:2-7 And he laid hold on the dragon, that old serpent, which is the Devil, and Satan, and bound him a thousand years, And cast him into the bottomless pit, and shut him up, and set a seal upon him, that he should deceive the nations no more, till the thousand years should be fulfilled: and after that he must be loosed a little season. …. And when the thousand years are expired, Satan shall be loosed out of his prison,
And the last reference is to the size of the new Jerusalem.
Revelation 21:16 And the city lieth foursquare, and the length is as large as the breadth: and he measured the city with the reed, twelve thousand furlongs…