once saved always saved is not biblical

Phil 2:12-16

12 Therefore, my beloved, as you have always obeyed, not as in my presence only, but now much more in my absence, work out your own salvation with fear and trembling;
13 for it is God who works in you both to will and to do for His good pleasure.

14 ¶ Do all things without complaining and disputing,

15 that you may become blameless and harmless, children of God without fault in the midst of a crooked and perverse generation, among whom you shine as lights in the world,

16 holding fast the word of life, so that I may rejoice in the day of Christ that I have not run in vain or labored in vain.

Study this guy

https://youtu.be/8CQgxpQGA_8?si=USvyrJw0L9y9HEBa