Philippians 1:5, 12, 16, 27

for your fellowship in the gospel from the first day until now

But I would ye should understand, brethren, that the things which happened unto me have fallen out rather unto the furtherance of the gospel

the one preach Christ of contention, not sincerely, supposing to add affliction to my bonds

Only let your conversation be as it becometh the gospel of Christ: that whether I come and see you, or else be absent, I may hear of your affairs, that ye stand fast in one spirit, with one mind striving together for the faith of the gospel