Do you have a chapter and verse for this? Perhaps my translation uses a different word for candlestick.
Revelation 2
1 Unto the angel of the church of Ephesus write; These things saith he that holdeth the seven stars in his right hand, who walketh in the midst of the seven golden candlesticks
5 Remember therefore from whence thou art fallen, and repent, and do the first works; or else I will come unto thee quickly, and will remove thy candlestick out of his place, except thou repent.
Note, using the law of exclusion:
7 He that hath an ear, let him hear what the Spirit saith unto the churches;
To him that overcometh will I give to eat of the tree of life, which is in the midst of the paradise of God.
The opposite of "overcometh" is to NOT overcome, thereby NOT being able to "eat of the tree of life". The writer does not really have to say, "and who doesnt overcome...etc" because that sentence automatically implied it.
12 And to the angel of the church in Pergamos write; These things saith he which hath the sharp sword with two edges
14 But I have a few things against thee, because thou hast there them that hold the doctrine of Balaam, who taught Balac to cast a stumblingblock before the children of Israel, to eat things sacrificed unto idols, and to commit fornication.
15 So hast thou also them that hold the doctrine of the Nicolaitanes, which thing I hate.
16 Repent; or else I will come unto thee quickly, and will fight against them with the sword of my mouth.
17 He that hath an ear, let him hear what the Spirit saith unto the churches; To him that overcometh will I give to eat of the hidden manna, and will give him a white stone, and in the stone a new name written, which no man knoweth saving he that receiveth it.
18 And unto the angel of the church in Thyatira write; These things saith the Son of God, who hath his eyes like unto a flame of fire, and his feet are like fine brass
20 Notwithstanding I have a few things against thee, because thou sufferest that woman Jezebel, which calleth herself a prophetess, to teach and to seduce my servants to commit fornication, and to eat things sacrificed unto idols.
21 And I gave her space to repent of her fornication; and she repented not.
22 Behold, I will cast her into a bed, and them that commit adultery with her into great tribulation, except they repent of their deeds.
23 And I will kill her children with death; and all the churches shall know that I am he which searcheth the reins and hearts: and I will give unto every one of you according to your works.
Lets use the law of exclusion again:
26 And he that overcometh, and keepeth my works unto the end, to him will I give power over the nations
27 And he shall rule them with a rod of iron; as the vessels of a potter shall they be broken to shivers: even as I received of my Father.
28 And I will give him the morning star.
So basically, those who do NOT overcome, who DO NOT keep his works unto the end, they will NOT get "power over the nations".
They will NOT rule them "with a rod of iron" and they will NOT get "the morning star".
Figurative language, but I believe we get the point. They will lose their position in salvation
Revelation 3
1 And unto the angel of the church in Sardis write; These things saith he that hath the seven Spirits of God, and the seven stars; I know thy works, that thou hast a name that thou livest, and art dead.
2 Be watchful, and strengthen the things which remain, that are ready to die: for I have not found thy works perfect before God.
5 He that overcometh, the same shall be clothed in white raiment; and I will not blot out his name out of the book of life, but I will confess his name before my Father, and before his angels.
Using that law of exclusion again:
If those in Sardis do NOT overcome, they will NOT be in the book of life, Christ will NOT confess them before the Father.
14 And unto the angel of the church of the Laodiceans write; These things saith the Amen, the faithful and true witness, the beginning of the creation of God
15 I know thy works, that thou art neither cold nor hot: I would thou wert cold or hot.
16 So then because thou art lukewarm, and neither cold nor hot, I will spue thee out of my mouth.
17 Because thou sayest, I am rich, and increased with goods, and have need of nothing; and knowest not that thou art wretched, and miserable, and poor, and blind, and naked:
18 I counsel thee to buy of me gold tried in the fire, that thou mayest be rich; and white raiment, that thou mayest be clothed, and that the shame of thy nakedness do not appear; and anoint thine eyes with eyesalve, that thou mayest see.
19 As many as I love, I rebuke and chasten: be zealous therefore, and repent.
20 Behold, I stand at the door, and knock: if any man hear my voice, and open the door, I will come in to him, and will sup with him, and he with me.
21 To him that overcometh will I grant to sit with me in my throne, even as I also overcame, and am set down with my Father in his throne.
Law of exclusion:
If the church the Laodiceans do NOT overcome, the will NOT sit with Christ in His throne.
There is no mistaking that these people are Christians. They are those in the church, saved members of Christs body, being commended and rebuked justly so. Most of those seven churches are chastised for transgressions that Christ literally told them would account for the loss of their salvation unless they would "overcome/repent".
No one can use the excuse that these people were never saved to begin with. It's undeniable.