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Everyone in Heaven is alive in Christ.

Matthew 17:3 Just then there appeared before them Moses and Elijah, talking with Jesus.

But...

Deut. 34:5 So Moses the servant of the LORD died there in the land of Moab, according to the word of the LORD.

So, Moses died. But he was alive and present before Christ at the Transfiguration.

Book of Wisdom 3:1-12

1 The souls of the righteous are in the hand of God,
and no torment shall touch them.

2 They seemed, in the view of the foolish, to be dead;
and their passing away was thought an affliction

3 and their going forth from us, utter destruction.
But they are in peace.

4 For if to others, indeed, they seem punished,
yet is their hope full of immortality;

5 Chastised a little, they shall be greatly blessed,
because God tried them and found them worthy of himself.

6 As gold in the furnace, he proved them,
and as sacrificial offerings he took them to himself.

7 In the time of their judgment they shall shine
and dart about as sparks through stubble;

8 They shall judge nations and rule over peoples,
and the LORD shall be their King forever.

9 Those who trust in him shall understand truth,
and the faithful shall abide with him in love:

Because grace and mercy are with his holy ones,
and his care is with the elect.

10 But the wicked shall receive a punishment to match their thoughts, since they neglected righteousness and forsook the LORD.

11 For those who despise wisdom and instruction are doomed.
Vain is their hope, fruitless their labors, and worthless their works.

12 Their wives are foolish and their children wicked,
accursed their brood.