No, those verses do not prove OSAS. And Jesus did not teach OSAS. I reject your tradition of men.
No, you actually reject what Jesus said so plainly.
However, as I said, there are more verses that also teach eternal security.
Eph 1:13,14
13 And you also were included in Christ when you heard the message of truth, the gospel of your salvation.
When you believed, you were marked in him with a seal, the promised Holy Spirit,
14 who is a deposit guaranteeing our inheritance until the redemption of those who are God’s possession—to the praise of his glory.
What you cannot deny (I hope) is that those who are sealed in Christ by the Holy Spirit are God's possession.
And v.14 says the sealing with the Holy Spirit is a deposit that GUARANTEES the believer's inheritance until the redemption of God's possession.
See? Verses that unambiguously teach eternal security.
But wait. There are more.
Eph 4:30 - And do not grieve the Holy Spirit of God, with whom you were sealed for the day of redemption.
If Paul believed that salvation could be lost, what a perfect verse to add that warning.
But, instead, even those who "grieve the Holy Spirit" are reminded from 1:13,14 that they are sealed for the day of redemption.
Does "redemption" sound anything like loss of salvation? Obviously not.
Even more.
2 Cor 1:22 - set his seal of ownership on us, and
put his Spirit in our hearts as a deposit, guaranteeing what is to come.
2 Cor 5:5 - Now the one who has fashioned us for this very purpose is God, who has
given us the Spirit as a deposit, guaranteeing what is to come.
So, based on Eph 1:13,14 and these 2 verses above, just what do you suppose is "guaranteed to come"?
So, as you can see if your eyes are open, there ARE verses that very plainly and unambiguously state that our salvation is eternally secure.
The teaching that salvation can be lost is what is man-made.
I'd even say it is a doctrine of demons. What better way to keep believers off guard and worrying about getting into heaven than the demonic teaching that God may pull the plug on you.