Resurrection, the first
'The first resurrection,' mentioned in Revelation 20:5, 6, does not mean a first resurrection, but the essence and primary part of resurrection, which is salvation and eternal life. There is only one resurrection to life. A second does not happen, and is not mentioned anywhere in the Bible.
(References: Apocalypse Explained 6; Apocalypse Revealed 851; Revelation 20:5-6)
Genesis 15:9-12
9
He said to him, "Bring me a heifer three years old, a female goat three years old, a ram three years old, a turtledove, and a young pigeon."
10
He brought him all of these, and divided them in the middle, and laid each half opposite the other; but he didn't divide the birds.
11
The birds of prey came down on the carcasses, and Abram drove them away.
12
When the sun was going down, a deep sleep fell on Abram. Now terror and great darkness fell on him.