Is Once Saved Always Saved a True Doctrine?

Acts Acts 8 1 John 1 John 1 Revelation Revelation 2 Galatians Galatians 6 Hebrews Galatians 5 Colossians Hebrews 3 1 Corinthians Colossians 3 1 Timothy 1 Corinthians 15 2 Peter 1 Timothy 1 2 Timothy 1 Timothy 4 John 1 Timothy 5 1 Peter 2 Peter 1 Ephesians 2 Timothy 2 Matthew Colossians 1 Romans John 8 Philippians 1 Timothy 6 Proverbs Hebrews 10 Luke 1 Peter 5 James Ephesians 4 Matthew 7 Romans 14 Colossians 4 Hebrews 13 Philippians 2 Proverbs 15 1 Corinthians 10 2 Peter 2 Acts 20 Hebrews 6 Luke 22 James 1 1 John 3 Romans 1 1 Corinthians 9 John 10 Romans 8 Matthew 22 Romans 6