Philippians 1 6
I'm absolutely sure that God who began this good work in you will continue working and bring it to a successful conclusion when Jesus Christ returns.
Compare with other 3 random translations
KJV Philippians 1:6being confident of this very thing, that he which hath begun a good work in you will perform it until the day of Jesus Christ:
NKJ Philippians 1:6being confident of this very thing, that He who has begun a good work in you will complete it until the day of Jesus Christ;
NCV Philippians 1:6God began doing a good work in you, and I am sure he will continue it until it is finished when Jesus Christ comes again.