Brahmarishi

In Hinduism, a Brahmarshi (Sanskrit brahmarṣi, a tatpurusha compound of brahma and ṛṣi) is a member of the highest class of Rishis (“seers” or “sages”), especially those credited with the composition of the hymns collected in the Rigveda

A Brahmarshi is a sage who has attained enlightenment (Kaivalya or Moksha) and became a Jivanmukta by completely understanding the meaning of Brahman and has attained the highest divine knowledge, infinite knowledge(omniscience) and self knowledge called Brahmajnana

When a Brahmarshi dies he attains Paramukti and frees himself from Samsara, the cycle of birth and death