To answer the question: Here is a verse proving eternal security:
John 6:37-40
All that the Father gives me will come to me, and whoever comes to me I will never cast out. For I have come down from heaven, not to do my own will but the will of him who sent me. And this is the will of him who sent me, that I should lose nothing of all that he has given me, but raise it up on the last day. For this is the will of my Father, that everyone who looks on the Son and believes in him should have eternal life, and I will raise him up on the last day.”
That should settle it. Everyone that the Father gives to the Son, will come to the Son and those who do come to the Son will never be cast out and Jesus will not lose any of them, but will raise them up on the last day.
Crystal clear.
John 6:35. Jesus said to them, "I am the bread of life; he who comes to Me will not hunger, and he who believes in Me will never thirst.
36. "But I said to you that you have seen Me, and yet do not believe.
37. "All that the Father gives Me will come to Me, and the one who comes to Me I will certainly not cast out.
38. "For I have come down from heaven, not to do My own will, but the will of Him who sent Me.
39. "This is the will of Him who sent Me, that of all that He has given Me I lose nothing, but raise it up on the last day.
40. "For this is the will of My Father, that everyone who beholds the Son and believes in Him will have eternal life, and I Myself will raise him up on the last day." (NASB, 1995)
In John 6:35 Jesus uses the Greek present tense when saying that He is the bread of life. When He says, however, “he who comes to Me” he shifts from the Greek present tense to the Greek present participle describing the action of being in the process of coming to Him. Therefore, those who are in the process of coming to Him will never thirst. The Greek word translated here “thirst” is in the Greek subjunctive mood meaning that this is a conditional statement; that is, those persons who are in the process of coming to Jesus will never thirst. This promise, therefore, does NOT apply to anyone who turns from Jesus and begins walking away, that is backslides. When He says, “who believes in Me” He again uses the Greek present participle describing the action of being in the process of believing in Him. Therefore, those who are in the process of believing in Him will never thirst. Therefore, never thirsting and salvation itself is CONDITIONAL upon our continuing in our faith. Compare Col. 1:21-23,
21. And although you were formerly alienated and hostile in mind,
engaged in evil deeds,
22. yet He has now reconciled you in His fleshly body through death, in order to present you before Him holy and blameless and beyond reproach--
23.
if indeed you continue in the faith firmly established and steadfast, and not moved away from the hope of the gospel that you have heard, which was proclaimed in all creation under heaven, and of which I, Paul, was made a minister. (NASB, 1995)
In John 6:37 Jesus uses the Greek future tense in the indicative mood when saying that “All that the Father gives Me will
come to Me” meaning that this is not a conditional statement but a statement of fact. When He says, however, “the one who comes to Me” He shifts from the Greek future tense to the Greek present participle describing again the action of being in the process of coming to Him. Therefore, those who are in the process of coming to Him He will not cast out.
The Greek word translated “cast” in verse 37 is in the Greek subjunctive mood meaning that this is a conditional statement; that is, those persons who are in the process of coming to Jesus He will not cast out. This promise, therefore, does NOT apply to anyone who turns from Jesus and begins walking away. The Greek word translated “lose” in verse 39 is also in the Greek subjunctive mood meaning that this is also a conditional statement; that is, it is the will of His Father that He lose nothing, but the actual outcome is conditional upon their continuing to come and their continuing to believe.
When He says in verse 40, “everyone who beholds the Son and believes” He again uses the Greek present participle describing the actions of being in the process of beholding the Son and believing in Him. Therefore, those who are in the process of beholding the Son and believing in Him will have eternal life. Therefore, having eternal life is CONDITIONAL upon our continuing in our faith. The Greek word translated “will have” (eternal life) in verse 40 is in the Greek subjunctive mood meaning that this is a conditional statement; that is, those persons who are in the process of beholding the Son and believing in Him will have eternal life.
Therefore, the Greek text of John 6:3 5-40 does NOT support the doctrine of eternal security (once saved, always saved). Indeed, it EXPRESSLY TEACHES that our having eternal life is CONDITIONAL upon our continuing to do three things,
1. come to Him
2. believe in Him
3 behold Him
This is why the doctrine of CONDITIONAL security is the Biblical doctrine and the doctrine of eternal security (once saved, always saved) is a non-Biblical doctrine, a doctrine that is expressly contradicted in the Bible.