Panchami of Shukla Paksha of Shravan month is known as Nag Panchami. Snakes are worshiped on this day. On this day, snakes are fed with milk. On this holy festival, women worship the serpent god and offer milk to snakes. On this day, women also pray for the safety of their brothers and family. It has been suggested in the Garuda Purana that on the day of Nagpanchami, the idol of Nag should be worshiped on both sides of the house. According to astrology, the lord of Panchami Tithi is Nag. That is, Panchami should be worshiped in Sheshnag etc.
Many stories are prevalent in ancient stories. One of them is as follows - A farmer lived in a state. The farmer had two sons and a daughter. One day, three snake children crushed and died while running the plow. The serpent kept mourning at first and then went to take revenge on the murderer of the child. In the night, the serpent bites the farmer, his wife and both boys. The next day the serpent arrived to bite the daughter of the farmer, the daughter of the farmer placed a bowl full of milk in front of the serpent and folded his hands and started apologizing. The serpent delighted, raising her parents and both brothers alive. That day was Shravan Shukla Panchami. Since then serpents are worshiped on this day to avoid the wrath of the serpent.