2. To protect the husband
For the first time, Indra's wife Shachi had tied a defence thread to protect Indra in the battle with Vrittasura. Therefore, whenever someone goes to war, he is worshipped by tying Kalaya, Mauli or Raksha Sutra on his wrist. Goddess Lakshmi had tied this bond to protect her husband by making King Bali her brother and took her hostage husband Sri Hari Vishnu with her.
