In later Vedic period three debts (Rin) were imagined. These debts were :
(i) Dev Rin
(ii) Pitra Rin
(iii) Rishi Rin. In the orgin of the imagination of these debt (Rin), the liabilities and duties of humans for society are hidden. In this world, every person has been receiving some knowledge, resources and power from his parents, guests, deities, sages and other creatures and has made his life happy and prosperous. This increased the burden of many debts on a person. Therefore, it is the duty of every human being to try to repay those debts.