God, ever preserves the beloved, and not one shall be lost... Here's a wonderment, it's my proof text 128, regarding Eternal Security (OSAS).

II Timothy 4:18: And the Lord shall deliver me from every evil work, and will PRESERVE me unto his heavenly kingdom: to whom be glory for ever and ever. Amen.

The Gospel, believe on Christ and live.

GOSPEL

Acts 16:30b-31: Sirs, what must I do to be saved?
And they said, Believe on the Lord Jesus Christ, and thou shalt be saved, and thy house.

I Corinthians 15:3-4: For I delivered unto you first of all that which I also received, how that Christ died for our sins according to the scriptures;
And that he was buried, and that he rose again the third day according to the scriptures:

ASSURANCE

John 5:24: Verily, verily, I say unto you, He that heareth my word, and believeth on him that sent me, hath everlasting life, and shall not come into condemnation; but is passed from death unto life.

I John 5:13: These things have I written unto you that believe on the name of the Son of God; that ye may know that ye have eternal life, and that ye may believe on the name of the Son of God.