Heidelberg Catechism · Lord's Day 21
55. What do you understand by the communion of saints?
Answer
First, that believers, all and everyone, as members of Christ have communion with him and share in all his treasures and gifts. Second, that everyone is duty-bound to use his gifts readily and cheerfully for the benefit and well-being of the other members.
Scripture references
1 John 1:3 · Romans 8:32 · 1 Corinthians 12:12-27 · 1 Corinthians 13:5 · Philippians 2:4-8
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