Introduction
Rashnu is the Yazata of justice, responsible, alongside Mithra and Sraosha, for judging the souls of the dead at the Chinvat Bridge, weighing their good and evil deeds to determine whether they pass on to paradise or are cast down.
The judgment of souls
In Zoroastrian eschatology, after death every soul faces judgment at the Chinvat Bridge, the crossing between the world of the living and the afterlife. Rashnu holds the scales of justice in this judgment, weighing a person's good thoughts, words and deeds against their evil ones with perfect impartiality; the righteous find the bridge widens beneath their feet, while the wicked find it narrows to the width of a blade, casting them down.
Absolute fairness
Rashnu is described as utterly incorruptible and impossible to deceive, a personification of perfect justice that cannot be swayed by bribery, favouritism or any other human weakness, a fitting counterpart to Mithra's role as guardian of truthful covenants.