King Indra is known as śata-kratu, which indicates that he has performed one hundred horse sacrifices ( aśvamedha-yajṣa ). We should know, however, that the animals sacrificed in the yajṣa were not killed. If the Vedic mantras were properly pronounced during the sacrifice, the animal sacrificed would come out again with a new life. That is the test for a successful yajṣa. When King Pṛthu was performing one hundred yajṣas, Indra became very envious because he did not want anyone to excel him. Being an ordinary living entity, he became envious of King Pṛthu, and, making himself invisible, he stole the horse and thus impeded the yajṣa performance.