Ab-Zohr

The Ab-Zohr (āb-zōhr) 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 (zohr < zaoϑra) to the waters (aban < apas) in order to purify them.

Read more about Ab-Zohr:  Technical Terms, Symbolism and Purpose, Bibliography