Ashem Vohu
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The Ashem Vohu (/ˈʌʃɛm ˈvɔːhuː/, Avestan: 𐬀𐬴𐬆𐬨⸱𐬬𐬊𐬵𐬏 aṣ̌əm vohū) is the second most important manthra, and one of the most important prayers in Zoroastrianism. It is dedicated to Asha, a Zoroastrian concept denoting truth, order or righteousness.
Together with the Ahuna Vairya, the Yenghe hatam, and the Airyaman ishya; the Ashem vohu forms the four manthras that enclose the Gathas in the Yasna. It is also at the end of most of the prayers in the Khordeh Avesta, except a certain few, most notably the Fravarane.