That’s the question asked by a recent Tabletalk Magazine article by Dr. Keith A. Mathison, professor of systematic theology at Reformation Bible College in Sanford, Florida.The article begins with a list of passages in which Jesus said that all that believers have “eternal life” followed by a set of passages in Which the Apostle Paul taught the same doctrine. Below is a list of those passages. The article also explains how Their is a link to the entire article at the bottom of this post. the article also explains how the doctrine of the perseverance of the saints was lost by the church and recovered.

The doctrine of the perseverance of the saints is well-grounded in Scripture. In the gospel of John, for example, we repeatedly read that believers have “eternal life.” Not temporary life, but eternal life.

• John 3:16: “For God so loved the world, that he gave his only Son, that whoever believes in him should not perish but have eternal life.”
• John 3:36: “Whoever believes in the Son has eternal life; whoever does not obey the Son shall not see life, but the wrath of God remains on him.”
• John 5:24: “Truly, truly, I say to you, whoever hears my word and believes him who sent me has eternal life. He does not come into judgment, but has passed from death to life.”
• John 6:35–40: “Jesus said to them, ‘I am the bread of life; whoever comes to me shall not hunger, and whoever believes in me shall never thirst. But I said to you that you have seen me and yet do not believe. 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.’”
• John 6:47: “Truly, truly, I say to you, whoever believes has eternal life.”
• John 10:27–29: “My sheep hear my voice, and I know them, and they follow me. I give them eternal life, and they will never perish, and no one will snatch them out of my hand. My Father, who has given them to me, is greater than all, and no one is able to snatch them out of the Father’s hand.”

The Apostle Paul teaches the same doctrine in his epistles:

• Romans 8:1: “There is therefore now no condemnation for those who are in Christ Jesus.”
• Romans 8:29–30: “For those whom he foreknew he also predestined to be conformed to the image of his Son, in order that he might be the firstborn among many brothers. And those whom he predestined he also called, and those whom he called he also justified, and those whom he justified he also glorified.”
• Romans 8:35–39: “Who shall separate us from the love of Christ? Shall tribulation, or distress, or persecution, or famine, or nakedness, or danger, or sword? As it is written, “For your sake we are being killed all the day long; we are regarded as sheep to be slaughtered.” No, in all these things we are more than conquerors through him who loved us. For I am sure that neither death nor life, nor angels nor rulers, nor things present nor things to come, nor powers, nor height nor depth, nor anything else in all creation, will be able to separate us from the love of God in Christ Jesus our Lord.”
• 1 Corinthians 1:7–9: “So that you are not lacking in any gift, as you wait for the revealing of our Lord Jesus Christ, who will sustain you to the end, guiltless in the day of our Lord Jesus Christ. God is faithful, by whom you were called into the fellowship of his Son, Jesus Christ our Lord.”
• Ephesians 1:5, 13, 14: “He predestined us for adoption to himself as sons through Jesus Christ, according to the purpose of his will. . . . In him you also, when you heard the word of truth, the gospel of your salvation, and believed in him, were sealed with the promised Holy Spirit, who is the guarantee of our inheritance until we acquire possession of it, to the praise of his glory.”

The entire article can be read online here:  Can Christians Lose Their Salvation? | Tabletalk (tabletalkmagazine.com)