Once you are dead or absent from the body you know nothing about things going on in the earth and cannot communicate to the living apart from a resurrection of the body:
Psalm 115:17 The dead praise not the Lord, neither any that go down into silence.
Psalm 6:5 For in death there is no remembrance of thee: in the grave who shall give thee thanks?
Psalm 146:4 His breath goeth forth, he returneth to his earth; in that very day his thoughts perish.
Eccles. 9:5 For the living know that they shall die: but the dead know not any thing, neither have they any more a reward; for the memory of them is forgotten.
Eccles. 9:10 Whatsoever thy hand findeth to do, do it with thy might; for there is no work, nor device, nor knowledge, nor wisdom, in the grave, whither thou goest.
Psalm 88:10-11 Wilt thou shew wonders to the dead? shall the dead arise and praise thee? Selah. Shall thy lovingkindness be declared in the grave? or thy faithfulness in destruction?
Psalm 90:10 The days of our years are threescore years and ten; and if by reason of strength they be fourscore years, yet is their strength labour and sorrow; for it is soon cut off, and we fly away.
Psalm 55:6 And I said, Oh that I had wings like a dove! for then would I fly away, and be at rest.
Eccl. 8:8 There is no man that hath power over the spirit to retain the spirit; neither hath he power in the day of death: and there is no discharge in that war; neither shall wickedness deliver those that are given to it.
Ecclesiastes 12:7 Then shall the dust return to the earth as it was: and the spirit shall return unto God who gave it.
Hebrews 9:27 And as it is appointed unto men once to die, but after this the judgment:
Luke 16: 23-31 And in hell he lift up his eyes, being in torments, and seeth Abraham afar off, and Lazarus in his bosom. And he cried and said, Father Abraham, have mercy on me, and send Lazarus, that he may dip the tip of his finger in water, and cool my tongue; for I am tormented in this flame. But Abraham said, Son, remember that thou in thy lifetime receivedst thy good things, and likewise Lazarus evil things: but now he is comforted, and thou art tormented. And beside all this, between us and you there is a great gulf fixed: so that they which would pass from hence to you cannot; neither can they pass to us, that would come from thence. Then he said, I pray thee therefore, father, that thou wouldest send him to my father's house: For I have five brethren; that he may testify unto them, lest they also come into this place of torment. Abraham saith unto him, They have Moses and the prophets; let them hear them. And he said, Nay, father Abraham: but if one went unto them from the dead, they will repent. And he said unto him, If they hear not Moses and the prophets, neither will they be persuaded, though one rose from the dead.
Heaven/Paradise is to rest not labour:
Revelation 6:10-11 And they cried with a loud voice, saying, How long, O Lord, holy and true, dost thou not judge and avenge our blood on them that dwell on the earth? And white robes were given unto every one of them; and it was said unto them, that they should rest yet for a little season, until their fellowservants also and their brethren, that should be killed as they were, should be fulfilled.
Revelation 14:13 And I heard a voice from heaven saying unto me, Write, Blessed are the dead which die in the Lord from henceforth: Yea, saith the Spirit, that they may rest from their labours; and their works do follow them.
Luke 16:25 But Abraham said, Son, remember that thou in thy lifetime receivedst thy good things, and likewise Lazarus evil things: but now he is comforted, and thou art tormented.
Prayer is labor and is not performed by the saints in heaven- for they rest.
Col.4:12
Epaphras, who is one of you, a servant of Christ, saluteth you, always labouring fervently for you in prayers, that ye may stand perfect and complete in all the will of God.
Rom.15:30
Now I beseech you, brethren, for the Lord Jesus Christ's sake, and for the love of the Spirit, that ye strive together with me in your prayers to God for me;
Luke 18:1, 7
And he spake a parable unto them to this end, that men ought always to pray, and not to faint;
And shall not God avenge his own elect, which cry day and night unto him, though he bear long with them?
Trying to communicate with the dead is expressly forbidden:
Isa.8: 19-20 And when they shall say unto you, Seek unto them that have familiar spirits, and unto wizards that peep, and that mutter: should not a people seek unto their God? for the living to the dead? To the law and to the testimony: if they speak not according to this word, it is because there is no light in them.
Luke 24:5 …they said unto them, Why seek ye the living among the dead?
Deut.18: 10-12 There shall not be found among you any one that maketh his son or his daughter to pass through the fire, or that useth divination, or an observer of times, or an enchanter, or a witch. Or a charmer, or a consulter with familiar spirits, or a wizard, or a necromancer. For all that do these things are an abomination unto the Lord: and because of these abominations the Lord thy God doth drive them out from before thee.
Leviticus 20:6 And the soul that turneth after such as have familiar spirits, and after wizards, to go a whoring after them, I will even set my face against that soul, and will cut him off from among his people.
v27 A man also or woman that hath a familiar spirit, or that is a wizard, shall surely be put to death: they shall stone them with stones: their blood shall be upon them.
1 Samuel 28:8 and he said, I pray thee, divine unto me by the familiar spirit, and bring me him up, whom I shall name unto thee.
1 Chronicles 10:13 So Saul died for his transgression which he committed against the Lord, even against the word of the Lord, which he kept not, and also for asking counsel of one that had a familiar spirit, to enquire of it;
2 Chronicles 33:6 And he caused his children to pass through the fire in the valley of the son of Hinnom: also he observed times, and used enchantments, and used witchcraft, and dealt with a familiar spirit, and with wizards: he wrought much evil in the sight of the Lord, to provoke him to anger.
2 Kin.23:24 Moreover the workers with familiar spirits, and the wizards, and the images, and the idols, and all the abominations that were spied in the land of Judah and in Jerusalem, did Josiah put away, that he might perform the words of the law which were written in the book that Hilkiah the priest found in the house of the Lord.
Oddly enough in our day with ghost hunting and paranormal pursuits someone has developed a software app to assist with 'communicating with the dead' which the spirits "seem to love":
https://www.youtube.com/watch?v=VRgLo7-QJ-E
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