Capital is mentioned in the Quran in these verses:
[2:278] O you who believe, you shall observe God and refrain from all kinds of usury, if you are believers.
[2:279] If you do not, then expect a war from God and His messenger. But if you repent, you may keep your capitals, without inflicting injustice, or incurring injustice.
To learn more, read the Quran in English.
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