Explanation:

 Rishava was said to be the first Tirthankara..

In jainism, a tirtha?kara is a human being who helps in achieving liberation and enlightenment as an arihant. According to jain scriptures,that which helps one to cross the great ocean of worldly life is a tirtha “ford” and a person who fills that role is a tirtha?kara “ford-maker”. tirtha?karas achieve liberation and enlightenment by destroying their constraining (karmas) and becoming role models and leaders for those seeking spiritual guidance. They also seek kevala gyan, a state of permanent, perpetual, absolute knowledge of the soul; it is the precursor to final liberation from the cycle of birth and death.

The tirthankars are also called arihantas.  arihanta means destroyer of enemies. Here the enemy means the enemies of the soul. These are internal enemies and are defined as the passion of anger, ego, greed, and deceit (krodh, maan, maya, lobh) etc. a soul can only reach the state of arihanta by overcoming all its inner enemies. a person when destroys all the four ghati karmas means they are totally detached from all worldly aspects and then he becomes an arihant and attains the perfect knowledge, vision, power, and bliss