Philippians 1:6 in the World English Bible
being confident of this very thing, that he who began a good work in you will complete it until the day of Jesus Christ.
Context
5 For your fellowship in the gospel from the first day until now;
6 Being confident of this very thing, that he which hath begun a good work in you will perform it until the day of Jesus Christ:
7 Even as it is meet for me to think this of you all, because I have you in my heart; inasmuch as both in my bonds, and in the defence and confirmation of the gospel, ye all are partakers of my grace.