You are talking about a whole... lot of New Testament Scripture from those like Apostle Paul and Peter, not just Lord Jesus.
Firstly, Christ gave several warnings against being deceived in His Olivet discourse, and He was speaking to His Church.
The whole 2 Thessalonians 2 Chapter by Apostle Paul is a warning to not fall away to the "strong delusion" which is about being deceived by that coming "man of sin".
Paul in 2 Corinthians 11 admonished us to remain as "a chaste virgin" waiting on Christ, our true Husband, and not fall away to the "another Jesus" that some instead preach.
In 2 Timothy 3, Apostle Paul warns that in the last days the deceived will have a form of godliness but denying the power thereof, ever learning but never able to come to the knowledge of the Truth. Just as Jannes and Jambres withstood Moses, these also resist the Truth, MEN OF CORRUPT MINDS, REPROBATE CONCERNING THE FAITH.
Jesus in Matthew 7 with those who will say, "Lord, Lord..." on the day of His future return and He will turn them away because of their working "iniquity", even though they preached Christ in their streets, cast out devils in Christ's Name, and did many wonderful works in Christ's Name.
The "unprofitable servant" of Matthew 25 that buried the symbolic money his master gave him to work with, is cast to the "outer darkness" with the hypocrite.
The "five foolish virgins" of Matthew 25 that had only the Oil (Holy Spirit) that was in their lamps Jesus rejects at His coming.
1 Tim 4:1-2
4 Now the Spirit speaketh expressly, that in the latter times some shall depart from the faith, giving heed to seducing spirits, and doctrines of devils;
2 Speaking lies in hypocrisy; having their conscience seared with a hot iron;
KJV
1 Tim 4:16
16 Take heed unto thyself, and unto the doctrine; continue in them: for in doing this thou shalt both save thyself, and them that hear thee.
KJV
The "natural brute beasts" that Peter warned of that turn brethren away from Christ...
2 Peter 2:18-22
18 For when they speak great swelling words of vanity, they allure through the lusts of the flesh, through much wantonness, those that were clean escaped from them who live in error.
19 While they promise them liberty, they themselves are the servants of corruption: for of whom a man is overcome, of the same is he brought in bondage.
20 For if after they have escaped the pollutions of the world through the knowledge of the Lord and Saviour Jesus Christ, they are again entangled therein, and overcome, the latter end is worse with them than the beginning.
21 For it had been better for them not to have known the way of righteousness, than, after they have known it, to turn from the holy commandment delivered unto them.
22 But it is happened unto them according to the true proverb, The dog is turned to his own vomit again; and the sow that was washed to her wallowing in the mire.
KJV
Acts 20:27-31
27 For I have not shunned to declare unto you all the counsel of God.
28 Take heed therefore unto yourselves, and to all the flock, over the which the Holy Ghost hath made you overseers, to feed the church of God, which He hath purchased with His own blood.
29 For I know this, that after my departing shall grievous wolves enter in among you, not sparing the flock.
30 Also of your own selves shall men arise, speaking perverse things, to draw away disciples after them.
31 Therefore watch, and remember, that by the space of three years I ceased not to warn every one night and day with tears.
KJV
Those are just a 'few'... Bible Scripture examples of a believer falling away from the Faith. Welcome to The Actual Word of God.
""""You are talking about a whole... lot of New Testament Scripture from those like Apostle Paul and Peter, not just Lord Jesus.
I'm talking about what Scripture teaches for today as listed here.
..
Who did Christ select as the Apostle & Minister to the Gentiles ?
Acts 9:15
But the Lord said unto him, Go thy way: for he is a chosen vessel unto me, to bear my name before the Gentiles, ...
Rom 11:13
For I speak to you Gentiles, inasmuch as I am the apostle of the Gentiles...
Rom 15:16
That I should be the minister of Jesus Christ to the Gentiles, ministering the gospel of God...
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The other Apostles agreed & knew who taught who
Gal 2:2
And I went up by revelation, and communicated unto them that gospel which I preach among the Gentiles,....
Gal 2:7
But contrariwise, when they saw that the gospel of the uncircumcision was committed unto me, as the gospel of the circumcision was unto Peter;
Gal 2:9
And when James, Cephas, and John, who seemed to be pillars, perceived the grace that was given unto me, they gave to me and Barnabas the right hands of fellowship; that we should go unto the heathen, and they unto the circumcision.
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What is the role of an Apostle/Minister ?
To teach THEIR audience.
BUT NOW there are NO SEPARATE audiences ALL are equal :-
Gal 3:28
There is neither Jew nor Greek, there is neither bond nor free, there is neither male nor female: for ye are all one in Christ Jesus.
Gal 6:15
For in Christ Jesus neither circumcision availeth any thing, nor uncircumcision, but a new creature.
1 Cor 12:13
For by one Spirit are we all baptized into one body, whether we be Jews or Gentiles, whether we be bond or free; and have been all made to drink into one Spirit.
Col 3:11
Where there is neither Greek nor Jew, circumcision nor uncircumcision, Barbarian, Scythian, bond nor free: but Christ is all, and in all.
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How are believers 'today' saved, sealed, justified, made righteous ?
By the SAVING Gospel that applies today.
Gal 1:11-12
11But I certify you, brethren, that the gospel which was preached of me is not after man.
12For I neither received it of man, neither was I taught it, but by the revelation of Jesus Christ.
1 Cor 15:1-4
1Moreover, brethren, I declare unto you the gospel which I preached unto you, which also ye have received, and wherein ye stand;
2By which also ye are saved, if ye keep in memory what I preached unto you, unless ye have believed in vain.
3For I delivered unto you first of all that which I also received, how that Christ died for our sins according to the scriptures;
4And that he was buried, and that he rose again the third day according to the scriptures:
Eph 1:13
13In whom ye also trusted, after that ye heard the word of truth, the gospel of your salvation: in whom also after that ye believed, ye were sealed with that holy Spirit of promise,
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The PERFORMANCE conditions :-
Titus 3:
5Not by works of righteousness which we have done, but according to his mercy he saved us, by the washing of regeneration, and renewing of the Holy Ghost;
Gal 2:
16Knowing that a man is not justified by the works of the law, but by the faith of Jesus Christ, even we have believed in Jesus Christ, that we might be justified by the faith of Christ, and not by the works of the law: for by the works of the law shall no flesh be justified.
Rom 3:
28Therefore we conclude that a man is justified by faith without the deeds of the law.
Eph 2:
8For by grace are ye saved through faith; and that not of yourselves: it is the gift of God:
9Not of works, lest any man should boast.
Rom 4:
5But to him that worketh not, but believeth on him that justifieth the ungodly, his faith is counted for righteousness.
Rom 5:
1Therefore being justified by faith, we have peace with God through our Lord Jesus Christ:
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Your 'deeds'/works/behavior/performance only decide your eternal rewards/loss
Rom 14:10
10But why dost thou judge thy brother? or why dost thou set at nought thy brother? for we shall all stand before the judgment seat of Christ.
1 Cor 3:10-15
10According to the grace of God which is given unto me, as a wise masterbuilder, I have laid the foundation, and another buildeth thereon. But let every man take heed how he buildeth thereupon.
11For other foundation can no man lay than that is laid, which is Jesus Christ.
12Now if any man build upon this foundation gold, silver, precious stones, wood, hay, stubble;
13Every man's work shall be made manifest: for the day shall declare it, because it shall be revealed by fire; and the fire shall try every man's work of what sort it is.
14If any man's work abide which he hath built thereupon, he shall receive a reward.
2 Cor 5:10
10For we must all appear before the judgment seat of Christ; that every one may receive the things done in his body, according to that he hath done, whether it be good or bad.