Dr Bhavasar told me that Zend Avesta is nothing but Veda ---- and
Gathas, the original song of Zarathustra is nothing but studied using
pre-Rig Vedic sanskrit.
The cold mantra is said by Ahura Mazda in Zoroastrianism,
"ashem vohu vahistem asti oosta asti oosta ahmai hyut ashai vahishtai
ashem"
The directions of backward walking when saying this mantra is the same
as "aum rhaam rheem rhoom rahim rahoom raha"
When I asked we can say "aum rhaam rheem ....." in the morning and
"ashem vohu" in the night he said "chalega" or will do.
But a lot of people have to say ashem vohu to bring rain
..
Erach