Vaisesika Sūtra 4.2.04

न त्र्यात्मकम् ॥४॥

na tryātmakam ॥4॥

[न (na) - not; त्रि-आत्मकम् (tri-ātmakam) - threefold in nature;]

The ātman is not of threefold (body, senses, and objects of perception) nature.