There is a popular story related to Raksha Bandhan, when Bahadur Shah attacked Chittore there was nobody to fight with him. King Vikramaditya who was ruling Chittore at that time was an incapable ruler. So, his mother Queen Karnavati sent a Rakhi to King Humayun and asked him to save her from Bahadur Shah. When the Rakhi was received by King Humayun his advisers told him not to help the Queen as Late Rana Sanga husband of Queen Karnvati was a rival of King Humayun. But, the king agreed to help the Queen as it is the duty of every brother to save his sister.
This story proves the meaning of Raksha Bandhan and also proves that Raksha Bandhan does not limits with religion. Once again, Happy Raksha Bandhan to you all.