I'm sure you've all heard it before. That demons disguised as loved ones will try to convince Adventists that their theology is wrong. Honestally I find very little Biblical support for this verse. Also, as far as I know, most protestant churchs do not believe that people in heaven can communicate with the living.
Of course I have limited knowlegde on this so called Biblical truth. However I doubt it can proved without EGW. Feel free to further educate me into this so called "doctrine"
I've heard that before, too, and it does come from Ellen White:
Spiritualists are increasing in numbers. They will come to men who have the truth as Satan came to Christ, tempting them to manifest their power, and work miracles, and give evidence of their being favored of God, and of their being the people who have the truth. Satan said to Christ, "If thou be the Son of God, command these stones that they be made bread." Herod and Pilate asked Christ to work miracles when he was on trial for his life. Their curiosity was aroused, but Christ did not work a miracle to gratify them. {ST, April 12, 1883 par. 5}
Spiritualists will press the matter to engage in controversy with ministers who teach the truth. If they decline, they will dare them. They quote Scripture, as did Satan to Christ. "Prove all things," say they. But their idea of proving is to listen to their deceptive reasonings, and attend their circles. But in their gatherings the angels of darkness assume the forms of dead friends, and communicate with them as angels of light. {ST, April 12, 1883 par. 6}
Their loved ones will appear in robes of light, as familiar to the sight as when they were upon the earth. They will teach them, and converse with them. And many will be deceived by this wonderful display of Satan's power. The only safety for the people of God is to be thoroughly conversant with their Bibles, and be intelligent upon the reasons of our faith in regard to the sleep of the dead. {ST, April 12, 1883 par. 7}
Satan is a cunning foe. And it is not difficult for the evil angels to represent both saints and sinners who have died, and make these representations visible to human eyes. These manifestations will be more frequent, and developments of a more startling character will appear as we near the close of time. We need not be astonished at anything in the line of deceptions to allure the unwary, and deceive, if possible, the very elect. Spiritualists quote, "Prove all things." But God has, for the benefit of his people who live amid the perils of the last days, proved this class, and given the result of his proving. {ST, April 12, 1883 par. 8}
2 Thess. 2:9-12: "Even him, whose coming is after the working of Satan with all power and signs and lying wonders, and with all deceivableness of unrighteousness in them that perish; because they received not the love of the truth, that they might be saved. And for this cause God shall send them strong delusion, that they should believe a lie; that they all might be damned who believed not the truth, but had pleasure in unrighteousness." {ST, April 12, 1883 par. 9}
John, upon the Isle of Patmos, saw the things which should come upon the earth in the last days. Rev. 13:13, 16:14: "And he doeth great wonders, so that he maketh fire come down from heaven on the earth in the sight of men." "For they are the spirits of devils, working miracles, which go forth unto the kings of the earth and of the whole world, to gather them to the battle of that great day of God Almighty." {ST, April 12, 1883 par. 10}
The apostle Peter distinctly points out the class which will be manifested in these last days. {ST, April 12, 1883 par. 11}
2 Pet. 2:10-14: "But chiefly them that walk after the flesh in the lust of uncleanness, and despise government. Presumptuous are they, self-willed, they are not afraid to speak evil of dignities. Whereas, angels, which are greater in power and might, bring not railing accusation against them before the Lord. But these, as natural brute beasts made to be taken and destroyed, speak evil of the things that they understand not; and shall utterly perish in their own corruption, and shall receive the reward of unrighteousness, as they that count it pleasure to riot in the daytime. Spots they are and blemishes, sporting themselves with their own deceivings while they feast with you; having eyes full of adultery, and that cannot cease from sin; beguiling unstable souls; a heart they have exercised with covetous practices; cursed children." {ST, April 12, 1883 par. 12}
God, in his word, has placed his stamp upon the heresies of spiritualism as he placed his mark upon Cain. The godly need not be deceived if they are students of the Scriptures and obedient to follow the plain path marked out for them in the word of God. {ST, April 12, 1883 par. 13}
The boastful spiritualist claims great freedom, and in smooth, flowery language seeks to fascinate and delude unwary souls to choose the broad path of pleasure and sinful indulgence, rather than the narrow path and the straight way. Spiritualists call the requirements of God's law bondage, and say those who obey them live a life of slavish fear. With smooth words and fair speeches they boast of their freedom, and seek to cover their dangerous heresies with the garments of righteousness. They would make the most revolting crimes be considered as blessings to the race. {ST, April 12, 1883 par. 14}
They open before the sinner a wide door to follow the promptings of the carnal heart, and violate the law of God, especially the seventh commandment. Those who speak these great swelling words of vanity, and who triumph in their freedom in sin, promise those whom they deceive the enjoyment of freedom in a course of rebellion against the revealed will of God. These deluded souls are themselves in the veriest bondage to Satan and are controlled by his power, and yet promising liberty to those who will dare to follow the same course of sin that they themselves have chosen. {ST, April 12, 1883 par. 15}
The Scriptures are indeed fulfilled in this, that the blind are leading the blind. For by whom a man is overcome, of the same is he brought in bondage. These deluded souls are under the most abject slavery to the will of demons. They have allied themselves to the powers of darkness and have no strength to go contrary to the will of demons. This is their boasted liberty. By Satan they are overcome and brought into bondage, and the great liberty promised to those they deceive is helpless slavery to sin and Satan. {ST, April 12, 1883 par. 16}
Most Christians that I've talked to who believe in some kind of intermediate existence between death and the resurrection don't believe that their dead loved ones can communicate with them, so they wouldn't be likely to be deceived by such manifestations as EGW predicted.