Xenophon

Oeconomicus

IV. 24.

(Cyrus the Younger to Lysander)

Do you wonder at this, Lysander? I swear to you by Mithra that whenever I am in health I never break my fast without perspiring.

Cyropaedia

VII. 5.

(Artabazus to Cyrus the Elder):

By Mithra I could not come to you yesterday without fighting my way through many foes.