On the night before the last Wednesday of the year is celebrated by Iranians as Chahārshanbe Suri. The festival is the celebration of the light (the good) winning over the darkness (the bad).
The tradition includes people going into the streets to make bonfires and jump over them while singing the traditional song Zardi-ye man az to, sorkhi-ye to az man that literally translates to “My yellowness is yours, your redness is mine,” with the figurative message “My paleness (pain, sickness) for you (the fire), your strength (health) for me.”
The fire is believed to burn out all the fear (yellowness) in their subconscious or their spirit, in preparation for New Year.