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16 He also forced everyone, small and great, rich and poor, free and slave, to receive a mark on his right hand or on his forehead, 17 so that no one could buy or sell unless he had the mark, which is the name of the beast or the number of his name.
18 This calls for wisdom. If anyone has insight, let him calculate (count) the number of the beast, for it is man's number. His number is 666.
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http://www.e-dinar.com/html/1_0.html
The History of the Dinar & Dirham
Under what was known as the coin standard of the Khalif Umar Ibn al-Khattab, the weight of 10 dirhams was equivalent to 7 dinars (mithqals)
In the year 75 (695 CE) the Khalifah Abdalmalik ordered Al-Hajjaj to mint the first dirhams, thus he established officially the standard of Umar Ibn al-Khattab. In the next year he ordered the dirhams to be minted in all the regions of the Dar al-Islam. He ordered that the coins be stamped with the sentence: "Allah is Unique, Allah is Eternal". He ordered the removal of human figures and animals from the coins and that they be replaced with letters.
This command was then carried on throughout all the history of Islam. The dinar and the dirham were both round, and the writing was stamped in concentric circles. Typically on one side it was written the "tahlil" and the "tahmid", that is, "la ilaha ill'Allah" and "alhamdulillah"; and on the other side was written the name of the Amir and the date. Later on it became common to introduce the blessings on the Prophet, salla'llahu alayhi wa sallam, and sometimes, ayats of the Qur'an.
Gold and silver coins remained official currency until the fall of the Khalifate. Since then, dozens of different paper currencies were made in each of the new postcolonial national states created from the dismemberment of Dar al-Islam.
Revelation 13
1 And the dragon stood on the shore of the sea.
2 And I saw a beast coming out of the sea. He had ten horns and seven heads, with ten crowns on his horns, and on each head a blasphemous name. The beast I saw resembled a leopard, but had feet like those of a bear and a mouth like that of a lion. The dragon gave the beast his power and his throne and great authority.