Heidelberg Catechism · Lord's Day 41
108. What does the seventh commandment teach us?
Answer
That all unchastity is cursed by God, and that we must therefore detest it from the heart and live chaste and disciplined lives, both within and outside of holy marriage.
Scripture references
Leviticus 18:30 · Ephesians 5:3-5 · Jude 1:23 · 1 Corinthians 6:18-20 · Hebrews 13:4
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