The Bible teaches that you can turn away from the truth. No one can take away your salvation, no one can take you from God's hand, but you can walk away.
Luke 9:62
“Jesus replied, ‘No one who puts a hand to the plow and looks back is fit for service in the kingdom of God.’”
1 Timothy 4:1
The Spirit clearly says that in later times some will abandon the faith and follow deceiving spirits and things taught by demons. Abandon means they had faith, they were saved and left the faith.
“Then you will be handed over to be persecuted and put to death, and you will be hated by all nations because of me. At that time many will TURN AWAY from the faith and will betray and hate each other, and many false prophets will appear and deceive many people. Because of the increase of wickedness, the love of most will grow cold, but he who stands firm to the end will be saved.”
Matthew 24:9-13
Many will turn away from the truth, many. So they had the truth and turned back. He who stands firm, who does not turn back from the faith.
“Once you were alienated from God and were enemies in your minds because of your evil behavior. But now He has reconciled you by Christ’s physical body through death to present you holy in his sight, without blemish and free from accusation– IF indeed you continue in your faith, established and firm, not moved from the hope held out in the gospel. This is the gospel that you heard and that has been proclaimed to every creature under heaven, and of which I, Paul, have become a servant.”
Colossians 1:21-23
“…But they were broken off because of unbelief, and you stand by faith. Do not be arrogant, but be afraid. For if God did not spare the natural branches, he will not spare you either. Consider therefore the kindness and sternness of God: sternness to those who fell, but kindness to you, provided that you continue in His kindness. Otherwise, you also will be CUT OFF.”
Romans 11:20-22
“See to it, brothers, that none of you has a sinful, unbelieving heart that TURNS AWAY from the living God. But encourage one another daily, as long as it is called “Today,” so that none of you may be hardened by sin’s deceitfulness. We have come to share in Christ if we hold firmly till the end the confidence we had at first.”
Hebrews 3:12-14
Remain in me, and I will remain in you. No branch can bear fruit by itself; it must remain in the vine. Neither can you bear fruit unless you remain in me. I am the vine; you are the branches. IF a man remains in me and I in him, he will bear much fruit; apart from me you can do nothing. If anyone does not remain in me, he is like a branch that is THROWN AWAY and withers; such branches are picked up, thrown into THE FIRE and burned.”
John 15:1-6
I don't see how anyone could argue OSAS after reading these verses. And there are more. The Bible clearly doesn't teach OSAS.