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The Ab-Zohr (/ɑːb zɔːr, æb-/; Avestan: 𐬀𐬞 𐬰𐬀𐬊𐬚𐬭𐬀, romanized: ap-zaoθra; Middle Persian: 𐭠𐭯 𐭦𐭥𐭧𐭫, romanized: ab-zohr) is the culminating rite of the greater Yasna service, the principal Zoroastrian act of worship that accompanies the recitation of the Yasna liturgy.
As described in the liturgy that accompanies the procedure, the rite constitutes a symbolic offering (𐭦𐭥𐭧𐭫, zohr < 𐬰𐬀𐬊𐬚𐬭𐬀, zaoθra) to the waters (aban < apas) in order to purify them.