Philippians 1:6 in the King James Version
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:
Context
5 for your partnership in furtherance of the Good News from the first day until now;
6 being confident of this very thing, that he who began a good work in you will complete it until the day of Jesus Christ.
7 It is even right for me to think this way on behalf of all of you, because I have you in my heart, because both in my bonds and in the defense and confirmation of the Good News, you all are partakers with me of grace.