Histories

Then, invoking a terrible curse on the Persians if they did not win back the throne and take vengeance on the Magi, he threw himself headlong down from the tower; so Prexaspes, a man who was always well thought of, perished in this way.

The seven Persians, when they had decided to attack the Magi at once and not delay, prayed to the gods and set forth, knowing nothing of what had happened to Prexaspes.

But when they had gone half way they learned what had happened to Prexaspes. Then they argued there, standing beside the road, Otanes' party demanding that they delay and not attack while events were in flux, and Darius' party that they go directly and do what they had decided and not put it off.