II Th 2:3
3 Let no man deceive you by any means: for that day shall not come, except there come a falling away first, and that man of sin be revealed, the son of perdition;
Rev 13:11-16
11 And I beheld another beast coming up out of the earth; and he had two horns like a lamb, and he spake as a dragon.
12 And he exerciseth all the power of the first beast before him, and causeth the earth and them which dwell therein to worship the first beast, whose deadly wound was healed.
13 And he doeth great wonders, so that he maketh fire come down from heaven on the earth in the sight of men,
14 And deceiveth them that dwell on the earth by the means of those miracles which he had power to do in the sight of the beast; saying to them that dwell on the earth, that they should make an image to the beast, which had the wound by a sword, and did live.
15 And he had power to give life unto the image of the beast, that the image of the beast should both speak, and cause that as many as would not worship the image of the beast should be killed.
16 And he causeth all, both small and great, rich and poor, free and bond, to receive a mark in their right hand, or in their foreheads:
Rev 20:4
4 And I saw thrones, and they sat upon them, and judgment was given unto them: and I saw the souls of them that were beheaded for the witness of Jesus, and for the word of God, and which had not worshipped the beast, neither his image, neither had received his mark upon their foreheads, or in their hands; and they lived and reigned with Christ a thousand years.
(KJV)
I know that many expect microchip implants and other high-tech devices but what about some low-tech possibilities? How about these verses from the Quran:
48:29
Muhammad is the messenger of Allah. And those with him are hard against the disbelievers and merciful among themselves. Thou (O Muhammad) seest them bowing and falling prostrate (in worship), seeking bounty from Allah and (His) acceptance. The mark of them is on their foreheads from the traces of prostration. Such is their likeness in the Torah and their likeness in the Gospel - like as sown corn that sendeth forth its shoot and strengtheneth it and riseth firm upon its stalk, delighting the sowers - that He may enrage the disbelievers with (the sight of) them. Allah hath promised, unto such of them as believe and do good works, forgiveness and immense reward.
27:78-83
78 Lo! thy Lord will judge between them of His wisdom, and He is the Mighty, the Wise.
79 Therefor (O Muhammad) put thy trust in Allah, for thou (standest) on the plain Truth.
80 Lo! thou canst not make the dead to hear, nor canst thou make the deaf to hear the call when they have turned to flee;
81 Nor canst thou lead the blind out of their error. Thou canst make none to hear, save those who believe Our revelations and who have surrendered.
82 And when the word is fulfilled concerning them, We shall bring forth a beast of the earth to speak unto them because mankind had not faith in Our
revelations.
83 And (remind them of) the Day when We shall gather out of every nation a host of those who denied Our revelations, and they will be set in array;
8:11-14
11 When He caused calm to fall on you as a security from Him and sent down upon you water from the cloud that He might thereby purify you, and take
away from you the uncleanness of the Shaitan, and that He might fortify your hearts and steady (your) footsteps thereby.
12 When your Lord revealed to the angels: I am with you, therefore make firm those who believe. I will cast terror into the hearts of those who disbelieve.
Therefore strike off their heads and strike off every fingertip of them.
13 This is because they acted adversely to Allah and His Messenger; and whoever acts adversely to Allah and His Messenger-- then surely Allah is severe
in requiting (evil).
14 This-- taste it, and (know) that for the unbelievers is the chastisement of fire.