The article, in a comparative vein, scientifically substantiates the views on existence and knowledge in the heritage of Abu Rayhan Beruni and Abu Ali ibn Sina. From the history of philosophy we know that there were different views and teachings about existence. The concept of existence is a comprehensive concept, a universal philosophical concept, including materiality and spirituality, past and future, objective and subjective reality, death and life, spirit and body.

ontology, being, meanings, experiment, philosophy, science, science, development, matter, change, development.

Tahir Karim. The genius of Beruni. -Tashkent, 2007. - B.30.

Abu Rayhan al-Biruni. Selected works in 9 volumes -T. 3. - Tashkent, 2022. - P. 44.

Khairullaev M. Philosophical heritage of the peoples of Central Asia and the struggle of ideas. - Fergana, 1988. - P.39.

Ibn Sina. Treatise on the division of existing things. - Tashkent: Shark, 1983. - P. 128.

Ibn Sina. Book of Exile. - Tashkent: Fan, 1967. - P. 265-266.

Ibn Sina. Canon of medical science. Book 1. - Tashkent: Fan, 1996. - P 260-261.

Ibn Sina. Book of Salvation. - Tashkent: Shark, 1986. - P 224.

Ibn Sina. Notification. - Tashkent: Fan, 1976. - P. 264.

Masharipova G.K. The influence of the natural science and philosophical heritage of Abu Ali ibn Sina on the development of social thinking. Monograph. – Tashkent, publishing house “Navruz”, 2020. – 144 p.

Ibn Sina. Selected philosophical works. - Moscow: Science, 1980. - B.30.