Here are 2 Bible verses about marriage counseling, 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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Hebrews 13:4 KJV
4 Marriage is honourable in all, and the bed undefiled: but whoremongers and adulterers God will judge.