Yasna 51 (Gatha Vohu Kshathra) from the Gathas, with English translation. Composed some time in ~1500-1000 BCE in the Old Avestan language by Zoroaster himself, the Gathas are the most sacred texts of Zoroastrianism and among the oldest existing literature of the whole Indo-European language family.

Recitation done by Dr. Ramiyar Karanjia (http://on-lyne.biz/gathas/)