Also called Charshanbe Soori is an Iranian festival celebrated on the eve of the last Wednesday of the year. It is the first festivity of the Noruz Celebrations festival (the Iranian New Year). The last eve between Tuesday and Wednesday of the year, before the vernal equinox. Also observed by Afghanistan, Azerbaijan, Iraqi Kurdistan, Tajikistan, Turkey (by Azeris, Kurds and Persians).

Jumping over the fire
Before the start of the festival, people gather brushwood in an open, free exterior space. At sunset, after making one or more bonfires, they jump over the flames, singing sorkhi-ye to az man, zardi-ye man az to, literally meaning “[let] your redness [be] mine, my paleness yours”, or a local equivalent of it. This is considered a purification practice.

Taken from https://en.wikipedia.org/wiki/Chaharshanbe_Suri