24 For false messiahs and false prophets will appear and perform great signs and wonders to deceive, if possible, even the elect.
Matthew 24:24
Who is Matthew referring to when he says "the elect"?
As part of his arrangement for blessing mankind, God purposed a righteous heavenly government to bring redeemed mankind back into reconciliation with God. This heavenly government will have a king, appointed rulers and priests and earthly subjects.
Jesus Christ, born as a descendant of Abraham, was God's promised “seed,” and it is upon him that the Father conferred kingship. (Galatians 3:16) So, as indicated by God’s sworn oath to Abraham, it is by means of Jesus Christ that people out of all nations of the earth will be blessed.
As part of the Kingdom arrangement God has chosen some to become sharers with Christ in his Kingdom. Revelation 20:6 says that these "chosen ones" (elected) will rule in the heavenly kingdom as "kings and priests" for a thousand years. These will also be resurrected first.
Those who are selected by God for this role are anointed by God's spirit which produces an inordinate desire to leave all earthly ties and join their Lord in in heaven.
The elect, having the anointing of God's spirit will be the most difficult for satan to deceive, having proven their faith already....but he will give it his best shot...