Since the 30-70AD age is likened to the 40-year Exodus,
the 70-1070AD Millennium is likened to the age of Possessing the Promised Land during Joshua, Judges & Kings.
Beginning with the Lord's Return around 70AD:
John 6:39-40, John 6:44, John 6:53-54 ~preached around 29AD by Jesus Christ
39 And this is the Father's will which hath sent Me, that of all which He hath given Me I should lose nothing, but should raise it up again at the Last Day.
40 And this is the will of Him that sent Me, that every one which seeth the Son, and believeth on Him, may have everlasting life: and I will raise him up at the Last Day.
44 No man can come to Me, except the Father which hath sent Me draw him: and I will raise him up at the Last Day.
53 Then Jesus said unto them, Verily, verily, I say unto you, Except ye eat the flesh of the Son of man, and drink his blood, ye have no life in you.
54 Whoso eateth my flesh, and drinketh my blood, hath eternal life; and I will raise him up at the Last Day.
1 Thessalonians 4:16 ~penned around 51AD by Christ's Apostle Paul to the Christians at Thessalonica
For the Lord himself shall [future, after 51AD] descend from heaven with a shout, with the voice of the archangel, and with the trump of God: and the Dead in Christ shall [future, after 51AD] RISE FIRST:
And I foresaw the souls of them that were beheaded for the witness of Jesus, and for the word of God, and which had not worshipped the beast, neither his image, neither had received his mark upon their foreheads, or in their hands; and they LIVED and reigned with Christ a thousand years. 5 (But THE REST OF THE DEAD lived not again until the thousand years were finished). This is the FIRST RESURRECTION. 6 Blessed and holy is he that hath part in the FIRST RESURRECTION: on such the second death hath no power, but they shall be priests of God and of Christ, and shall reign with him a thousand years.
2 Peter 3:8
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.
The Dead in Christ = the souls of them that were beheaded for the witness of Jesus, and for the word of God, and which had not worshipped the beast, neither his image, neither had received his mark upon their foreheads, or in their hands.
The Rest of the Dead = the souls of everyone else who had died.
Christ raised up first HIS MARTYRS from the Nero-Beast Tribulation (the Dead in Christ) at the start of the Last Day.
And THE REST OF THE DEAD were raised up at the end of the Last Day to their sentence of Judgment.