[al-Khwārizmī] not having taken algebra from the Greeks,. . . must have either invented it himself, or taken it from the Indians. Of the two, the second appears to me the most probable.
Source, in full
Pietro Cossali, who wrote an extensive monograph on the history of algebra quoted in Heeffer, Albrecht. ‘The Reception of Ancient Indian Mathematics by Western Historians’. In Ancient Indian Leaps into Mathematics, edited by B. S. Yadav and Man Mohan, pp. 135-152. Birkhäuser, 2011. quoted in : Bhaskar Kamble, The Imperishable Seed: How Hindu Mathematics Changed the World and why this History was Erased, Garuda Prakashan Private Limited, 2022 ISBN 9798885750189