King Bali was a very generous man, he was so known that the gods feared he will go to heaven. They sent Vishwamitra to test him. The king received Vishwamitra with a lot of respect and great hospitality. Vishwamitra requested to be given two and half steps of earth. King Bali agreed. Vishwamitra then grew in size and covered the earth in two steps and for the half step there was no place so King Bali offered his own head. Vishwamitra put his foot on his head and thrust him down to the netherworld (Pataal). Radhika was sitting there and was surprised to see Bali in such a place. He told her about the two and half steps and she was so moved by him that she tied a string around his wrist (Dharmela) making him her brother. This day has come to be called Raksha Bandhan. King Bali is known as the most generous one.