'Side' in the Bible

Just one thing: Live your life in a manner worthy of the gospel of Christ. Then, whether I come and see you or am absent, I will hear about you that you are standing firm in one spirit, with one mind, working side by side for the faith that comes from the gospel,

Yes, I also ask you, true partner, to help these women who have contended for the gospel at my side, along with Clement and the rest of my coworkers whose names are in the book of life.