Here are 2 Bible verses about marriage in a church, curated from both the Old and New Testaments of the Holy Bible, King James Version, arranged from most to least relevant.
Ephesians 5:33 KJV
33 Nevertheless let every one of you in particular so love his wife even as himself; and the wife see that she reverence her husband.
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1 Corinthians 7:10-11 KJV
10 And unto the married I command, yet not I, but the Lord, Let not the wife depart from her husband: 11 But and if she depart, let her remain unmarried or be reconciled to her husband: and let not the husband put away his wife.