Legends behind Raksha Bandhan :

There are numerous Legends associated with the festival of Raksha Bandhan. In this section, we have come up some of the defining stories on Raksha Bandhan. Let's start with the meaning and importance of Raksha Bandhan. Literally, Raksha Bandhan means the sacred thread that is the symbol of a vow taken by the person on whose hand it is tied on.
Almost every festival in India has a mythological origin. It is believed that when Indra went to fight the Vritra( Asura), his wife tied a sacred thread on his wrist of Guru Brahaspati. Indra won over the Daitya Raja and established his granduer in Swarga again. The festival of Raksha Bandhan has strings attached to Pauranic Shastras. Yamuna was the sister of Lord Yama, the God of Death. She used to tie Rakhi to Yama on every Sharada Purnima. Since then, it is the custom that girls tie rakhi to their brothers.
Another legend has been taken from the epic Mahabharata. Yudhishtra, the eldest son of Pandava was advised by Shri Krishna to observe the rituals of Raksha Bandhan to ensure his safety in the upcoming war. He did so and we know the amazing results. Despite the fact that Pandavas had lesser manpower and other war resources, they gained victory over Kauravas. Alexander had a narrow escape due to Rakhi. In the battlefield, Porus stopped hitting Alexander with the sword remembering the Rakhi pledge. Alexander's wife tied Rakhi on the wrist of Porus and asked him to take the vow of protecting her husband.
Yet another story behind Raksha Bandhan, which needs a mention belong to the Mughal Era. A Rajput Princess Karnawati sent Rakhi to King Humayun and asked for help in fighting against a Gujarat Sultan. Despite, he was busy in some other work, he immediately went for Rani's help. However, it was a tragedy that Rani had already lost the battle and had committed suicide before Humayun could reach.
Now that we have gone through these amazing stories on Raksha Bandhan, you must have got the idea about the importance Raksha Bandhan holds in the hearts of Hindus.