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In Zoroastrianism

Zoroaster teaches that there are two powers in the universe; Asha, which is truth, order, and that which is real, and Druj, which is "the Lie". Later on, the Lie became personified as Angra Mainyu, a figure similar to the Christian Devil, who was portrayed as the eternal opponent of Ahura Mazda (God).

Herodotus, in his mid-fifth-century BC account of Persian residents of the Pontus, reports that Persian youths, from their fifth year to their twentieth year, were instructed in three things – "to ride a horse, to draw a bow, and to speak the Truth". He further notes that: "The most disgraceful thing in the world think, is to tell a lie; the next worst, to owe a debt: because, among other reasons, the debtor is obliged to tell lies."

In Achaemenid Persia, the lie, drauga (in Avestan: druj), is considered to be a cardinal sin and it was punishable by death in some extreme cases. Tablets discovered by archaeologists in the 1930s at the site of Persepolis give us adequate evidence about the love and veneration for the culture of truth during the Achaemenian period. These tablets contain the names of ordinary Persians, mainly traders and warehouse-keepers. According to Stanley Insler of Yale University, as many as 72 names of officials and petty clerks found on these tablets contain the word truth. Thus, says Insler, we have Artapana, protector of truth, Artakama, lover of truth, Artamanah, truth-minded, Artafarnah, possessing splendour of truth, Artazusta, delighting in truth, Artastuna, pillar of truth, Artafrida, prospering the truth, and Artahunara, having nobility of truth.

It was Darius the Great who laid down the "ordinance of good regulations" during his reign. Darius' testimony about his constant battle against the Lie is found in the Behistun Inscription. He testifies: "I was not a lie-follower, I was not a doer of wrong... According to righteousness I conducted myself. Neither to the weak or to the powerful did I do wrong. The man who cooperated with my house, him I rewarded well; who so did injury, him I punished well."

He asks Ahuramazda, God, to protect the country from "a (hostile) army, from famine, from the Lie".

Darius had his hands full dealing with large-scale rebellion which broke out throughout the empire. After fighting successfully with nine traitors in a year, Darius records his battles against them for posterity and tells us how it was the Lie that made them rebel against the empire. At the Behistun inscription, Darius says: "I smote them and took prisoner nine kings. One was Gaumata by name, a Magian; he lied; thus he said: I am Smerdis, the son of Cyrus... One, Acina by name, an Elamite; he lied; thus he said: I am king in Elam... One, Nidintu-Bel by name, a Babylonian; he lied; thus he said: I am Nebuchadnezzar, the son of Nabonidus.... The Lie made them rebellious, so that these men deceived the people." Then advice to his son Xerxes, who is to succeed him as the great king: "Thou who shalt be king hereafter, protect yourself vigorously from the Lie; the man who shall be a lie-follower, him do thou punish well, if thus thou shall think. May my country be secure!"