Consider three key examples.
Romans 11 "you stand only by your faith.. you should fear for if He did not spare them neither will He spare you"
Matt 18 - forgiveness revoked. "I forgave you ALL that debt..." then the one forgiven all - has his full debt returned.
Ezekiel 18 - forgiveness revoked
other texts to consider include 1 Cor 6 where Paul argues that certain behaviors get you booted from the camp of the saints.
Romans 2
4 Or do you think lightly of the riches of His kindness and tolerance and patience, not knowing that the kindness of God leads you to repentance? 5 But because of your stubbornness and unrepentant heart you are storing up wrath for yourself in the day of wrath and revelation of the righteous judgment of God, 6 who will render to each person according to his deeds: 7 to those who by perseverance in doing good seek for glory and honor and immortality, eternal life; 8 but to those who are selfishly ambitious and do not obey the truth, but obey unrighteousness, wrath and indignation. 9 There will be tribulation and distress for every soul of man who does evil, of the Jew first and also of the Greek, 10 but glory and honor and peace to everyone who does good, to the Jew first and also to the Greek. 11 For there is no partiality with God.
12 For all who have sinned without the Law will also perish without the Law, and all who have sinned under the Law will be judged by the Law; 13 for it is not the hearers of the Law who are just before God, but the doers of the Law will be justified. 14 For when Gentiles who do not have the Law do instinctively the things of the Law, these, not having the Law, are a law to themselves, 15 in that they show the work of the Law written in their hearts, their conscience bearing witness and their thoughts alternately accusing or else defending them, 16 on the day when, according to my Gospel, God will judge the secrets of men through Christ Jesus.
Romans 11
13 But I am speaking to you who are Gentiles. Inasmuch then as I am an apostle of Gentiles, I magnify my ministry, 14 if somehow I might move to jealousy my fellow countrymen and save some of them. 15 For if their rejection is the reconciliation of the world, what will their acceptance be but life from the dead? 16 If the first piece of dough is holy, the lump is also; and if the root is holy, the branches are too. 17 But if some of the branches were broken off, and you, being a wild olive, were grafted in among them and became partaker with them of the rich root of the olive tree, 18 do not be arrogant toward the branches; but if you are arrogant, remember that it is not you who supports the root, but the root supports you. 19 You will say then, “Branches were broken off so that I might be grafted in.”
20 Quite right, they were broken off for their unbelief, but you stand by your faith. Do not be conceited, but fear; 21 for if God did not spare the natural branches, He will not spare you, either. 22 Behold then the kindness and severity of God; to those who fell, severity, but to you, God’s kindness, if you continue in His kindness; otherwise you also will be cut off. 23 And they also, if they do not continue in their unbelief, will be grafted in, for God is able to graft them in again
The plain fact is none of these Scriptures SAY that salvation can be lost. And, there are clear passages that teach eternal security.
Here are some of them:
All references are from the NASB:
First, Paul described both justification (Rom 3:24, 5:15,16,17) and eternal life (Rom 6:23) as gifts of God. Then he wrote Rom 11:29 - the gifts and calling of God are irrevocable. Since he had already described what he meant by "gifts of God", there was no reason for him to specifically list what he meant by "gifts of God".
3:24 - being justified as a gift by His grace through the redemption which is in Christ Jesus
6:23 - For the wages of sin is death, but the free gift of God is eternal life in Christ Jesus our Lord.
11:29 - for the gifts and the calling of God are irrevocable.
Second, every believer is sealed with the Holy Spirit when they believe (Eph 1:13). This sealing is a pledge with a view to the redemption of God's own possession (believers - Eph 1:14).
And, this sealing is for the day of redemption (Eph 4:30).
1:13 - In Him, you also, after listening to the message of truth, the gospel of your salvation—having also believed, you were sealed in Him with the Holy Spirit of promise
1:14 - who is given as a pledge of our inheritance, with a view to the redemption of God’s own possession, to the praise of His glory.
4:30 - Do not grieve the Holy Spirit of God, by whom you were sealed for the day of redemption.
Third, Jesus tells us WHEN one HAS eternal life; when they believe (Jn 5:24). Then, He tells us that those to whom He gives eternal life WILL NEVER PERISH (Jn 10:28).
5:24 - “Truly, truly, I say to you, he who hears My word, and believes Him who sent Me, has eternal life, and does not come into judgment, but has passed out of death into life.
10:28 - and I give eternal life to them, and they will never perish; and no one will snatch them out of My hand.
Fourth, Paul stated that regardless of the believer's lifestyle, or "whether we are asleep or awake, we will be together with Him" in 1 Thess 5:10. The context begins in v.4 and contrasts believers with unbelievers, or day with night, or being alert with being asleep or sober with drunkeness.
4 But you, brethren, are not in darkness, that the day would overtake you like a thief;
5 for you are all sons of light and sons of day. We are not of night nor of darkness;
6 so then let us not sleep as others do, but let us be alert and sober.
7 For those who sleep do their sleeping at night, and those who get drunk get drunk at night.
8 But since we are of the day, let us be sober, having put on the breastplate of faith and love, and as a helmet, the hope of salvation.
9 For God has not destined us for wrath, but for obtaining salvation through our Lord Jesus Christ,
10 who died for us, so that whether we are awake or asleep, we will live together with Him.
Analysis of this passage:
v.4 tells us that believers are "not in darkness"
v.5 differentiates believers (sons of light and day) with unbelievers (not of night or darkness).
v.6 encourages believers to not live like unbelievers (not sleep as others do, but be alert and sober).
v.7 describes unbelievers and what they do.
v.8 explains that "since we are of the day" (believers), we need to be sober.
v.9 explains the destiny of the believer - not destined for wrath but for salvation
v.10 says that regardless of the believer's lifestyle, we will live together with Him.
Fifth, Jesus noted how people are saved in John 10:9 - “I am the door; if anyone enters through Me, he will be saved, and will go in and out and find pasture.
The Greek word for “enters” is in the aorist tense, meaning “in a point in time”, as opposed to the present tense, which those who believe in loss of salvation only emphasize. Iow, one must continue to believe in order to continue to have eternal life. Further, Paul used the aorist tense in his answer to the jailer in Acts 16:31, and Jesus used the aorist tense in Luke 8:12 “believed and be saved”.
Sixth, there are absolutely zero verses that warn us plainly that one can lose their salvation.
