In 1 Kings 7:5, this signifies perfection or the complete equality of what is just and what is perfect. (Arcana Coelestia 8917)

In Revelation 21:16, this signifies that in the Holy City, the New Jerusalem, the good of the church will be equal to its truth, and so justice will prevail. (Apocalypse Revealed 905) The court of the tabernacle (Exodus 27:9 and other places) signifies the external of heaven, or the first, which is also called the ultimate heaven.

(Odkazy: Arcana Coelestia 9741)

A 'thousand' means much, many, a countless number, a whole era of time, an abundance. When used in reference to the Lord, it actually means a number greater than that: In those cases it means what is infinite, what is truly without end.