The bible describes death as sleep .... many many many verses .... Jesus himself describes death as sleep
The bible teaches we are not immortal in any way, shape or form ... that does not happen until Jesus returns (at the last trump) and the 1st resurrection happens.
It is summed up here by Paul, although there is many many verses that supports his summation
1 Thessalonians 4
The Return of the Lord
13Brothers, we do not want you to be uninformed about those who sleep in death,
cso that you will not grieve like the rest, who are without hope.
14For since we believe that Jesus died and rose again, we also believe that God will bring with Jesus those who have fallen asleep in Him.
15By the word of the Lord, we declare to you that we who are alive and remain until the coming of the Lord will by no means precede those who have fallen asleep.
16For the Lord Himself will descend from heaven with a loud command, with the voice of an archangel, and with the trumpet of God, and the dead in Christ will be the first to rise.
17After that, we who are alive and remain will be caught up together with them in the clouds to meet the Lord in the air. And so we will always be with the Lord.
18Therefore encourage one another with these words.
and here
1 Corinthians 15
50Now I declare to you, brothers, that flesh and blood cannot inherit the kingdom of God, nor does the perishable inherit the imperishable.
51Listen, I tell you a mystery: We will not all sleep, but we will all be changed—
52in an instant, in the twinkling of an eye,
at the last trumpet. For the trumpet will sound, the dead will be raised imperishable, and we will be changed.
53For the perishable must be clothed with the imperishable, and the mortal with immortality.
54When the perishable has been clothed with the imperishable and the mortal with immortality, then the saying that is written will come to pass: “Death has been swallowed up in victory.” ...