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In page Sufism:

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The tenth-century Persian polymath Al-Biruni in his book Tahaqeeq Ma Lilhind Min Makulat Makulat Fi Aliaqbal Am Marzula (Critical Study of Indian Speech: Rationally Acceptable or Rejected) discusses the similarity of some Sufism concepts with aspects of Hinduism, such as: Atma with ruh, tanasukh with reincarnation, Mokhsha with Fanafillah, Ittihad with Nirvana: union between Paramatma in Jivatma, Avatar or Incarnation with Hulul, Vedanta with Wahdatul Ujud, Mujahadah with Sadhana.[citation needed]