John 14:30
>I will no longer talk much with you, for the ruler of this world is coming, and he has nothing in Me.
The devil seeks every soul after death to find in them what is His, namely, sin.
Luke 12:20
>But God said to him, ‘Fool! This night your soul will be required of you; then whose will those things be which you have provided?’
The demons will require the soul of the wicked and collect their possessions.
Luke 12:58
>When you go with your adversary to the magistrate, make every effort along the way to settle with him, lest he drag you to the judge, the judge deliver you to the officer, and the officer throw you into prison.
"The way" is our life, "the adversary" is the demon tempting us to sin against God, "the judge" is our Lord Jesus Christ, and if He finds us guilty of associating with the demon, He will throw us over to "the officer" (or more accurately "exactor", "tax-collector") who will make us pay for every sin we are guilty of, that is, he will collect back what is his.
Luke 16:22-23
>So it was that the beggar died, and was carried by the angels to Abraham’s bosom. The rich man also died and was buried. And being in torments in Hades, he lifted up his eyes and saw Abraham afar off, and Lazarus in his bosom.
Both angels and demons play a role at our death: the angels carry us off to Abraham's bosom, but then who carry us to Hades? It can only be the demons, because the angels would not bring us there, and we evidently cannot reach our destination on our own.
Luke 18:1-8
>Then He spoke a parable to them, that men always ought to pray and not lose heart, saying: “There was in a certain city a judge who did not fear God nor regard man. Now there was a widow in that city; and she came to him, saying, ‘Get justice for me from my adversary.’ And he would not for a while; but afterward he said within himself, ‘Though I do not fear God nor regard man, yet because this widow troubles me I will avenge her, lest by her continual coming she weary me.’” Then the Lord said, “Hear what the unjust judge said. And shall God not avenge His own elect who cry out day and night to Him, though He bears long with them? I tell you that He will avenge them speedily. Nevertheless, when the Son of Man comes, will He really find faith on the earth?”
If we cry to God to avenge us of our opponent, the devil, He will do so, and this extends to the hour of our death.
Ephesians 2:2
>in which you once walked according to the course of this world, according to the prince of the power of the air, the spirit who now works in the sons of disobedience
After our death, we attempt to rise to Heaven, but the sky above us is obscured by the devil and his demons. Even if Christ opened the path to Heaven for us, those who are distracted by the demons will steer off that path, and those who are sinning today are indebting themselves to the devil.
Ephesians 6:12-13
>For we do not wrestle against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this age, against spiritual hosts of wickedness in the heavenly places. Therefore take up the whole armor of God, that you may be able to withstand in the evil day, and having done all, to stand.
Again, the demons are described as dwelling not in Heaven, but in the air under. We fight against them now, rather than trusting them and so indebting ourselves to them as the sinners do.
Colossians 2:15
>Having disarmed principalities and powers, He made a public spectacle of them, triumphing over them in it.
How did the Lord triumph over the demons? By having nothing of them in Him upon His death, thus disarming them.
Hebrews 9:27
>And as it is appointed for men to die once, but after this the judgment
What judgment? God is the sole judge, but who accuses us and who defends us, but the demon and our guardian angel, respectfully?
1 Peter 5:8
>Be sober, be vigilant; because your adversary the devil walks about like a roaring lion, seeking whom he may devour.
We are the pray of the devil, who seeks our soul so that we may be eternally tormented along with him. Only our Lord can save us from him.