Sadeh is one of the Iranian celebrations held at the beginning of the evening on the 10th of the Bahman month. This celebration has a history of thousands of years and is considered one of the oldest Iranian celebrations (even older than Nowruz). Sadeh is celebrated as the discovery of fire. According to Ferdowsi's Shahnameh by the way Ferdosi is an Iranian poet and Shahname is his poetry book, he said the origin of this celebration dates back to the time of Houshang Shah, the second king of the Pishdadian dynasty. It is said that during a hunt, Houshang Shah, upon seeing a long black snake, threw a stone towards it, and when the stone collided with another stone, a spark was formed, igniting a dry bush where the snake was. Iranians have been safeguarding fire since that time. Among Zoroastrians, Sadeh is celebrated by lighting a fire and engaging in prayer.