1 Corinthians 16:13

13 aBe watchful, bstand firm in the faith, cact like men, dbe strong.

Philippians 1:27

27Only elet your manner of life be fworthy
Greek  Only behave as citizens worthy
of the gospel of Christ, so that whether I come and see you or am absent, I may hear of you hthat you are standing firm in one spirit, with ione mind jstriving side by side for the faith of the gospel,

Philippians 4:1

1Therefore, my brothers,
Or  brothers and sisters; also verses 8, 21
whom I love and llong for, mmy joy and ncrown, ostand firm thus in the Lord, my beloved.

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