What are the duties required in the eighth commandment?

The duties required in the eighth commandment are, truth, faithfulness, and justice in contracts and commerce between man and man; rendering to everyone his due; restitution of goods unlawfully detained from the right owners thereof; giving and lending freely, according to our abilities, and the necessities of others; moderation of our judgments, wills, and affections concerning worldly goods; a provident care and study to get, keep, use, and dispose these things which are necessary and convenient for the sustentation of our nature, and suitable to our condition; a lawful calling, and diligence in it; frugality; avoiding unnecessary lawsuits and suretyship, or other like engagements; and an endeavor, by all just and lawful means, to procure, preserve, and further the wealth and outward estate of others, as well as our own.

Proofs

• The duties required in the eighth commandment are, truth, faithfulness, and justice in contracts and commerce between man and man; (Psalm 15:2, 4; Zechariah 7:4, 10; 8:16–17)
• rendering to everyone his due; (Leviticus 6:2–5; Luke 19:8)
• restitution of goods unlawfully detained from the right owners thereof; (Luke 6:30, 38; 1 John 3:17; Ephesians 4:28; Galatians 6:10)
• giving and lending freely, according to our abilities, and the necessities of others; (1 Timothy 6:6–9)
• moderation of our judgments, wills, and affections concerning worldly goods; (1 Timothy 5:8)
• a provident care and study to get, (Proverbs 27:23–27; Ecclesiastes 3:12–13; Isaiah 38:1; Matthew 11:8)
• keep, use, and dispose these things which are necessary and convenient for the sustentation of our nature, and suitable to our condition; (1 Corinthians 7:20; Genesis 3:19)
• a lawful calling, (Ephesians 4:28; Proverbs 10:4)
• and diligence in it; (John 6:12; Proverbs 21:20)
• frugality; (1 Corinthians 6:1–9)
• avoiding unnecessary lawsuits (Proverbs 6:1–6)
• and suretyship, or other like engagements; (Leviticus 25:35; Deuteronomy 22:1–4; Exodus 23:4–5; Philippians 2:4)
• and an endeavor, by all just and lawful means, to procure, preserve, and further the wealth and outward estate of others, as well as our own.