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Often given as a saying of Aristotle with no reference.

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An interpretative gloss of Aristotle's position in Nicomachean Ethics book 1 section 9, tacitly inserted by J. A. K. Thomson in his English translation The Ethics of Aristotle (1955). The original Greek at [https://www.perseus.tufts.edu/hopper/text?doc=Pe

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Attributed to Aristotle in Bernhoff A. Dahl, [http://books.google.gr/books?id=B1Z2XP_DamQC&dq= Optimize Your Life!], Trionics International Inc., 2005, p. 111.

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Attributed to Aristotle in Lowell L. Bennion, [http://books.google.gr/books?id=2HPUAAAAMAAJ&q= Religion and the Pursuit of Truth], Deseret Book Company, 1959, p. 52, and in [http://books.google.gr/books?id=irofAQAAMAAJ&q= American Opinion, Volume 24], Rob

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"The Letter of Aristotle to Alexander on the Policy toward the Cities", translated from Lettre d'Aristote à Alexandre sur la politique envers les cités, an Arabic text translated and edited by Józef Bielawski and Marian Plezia (1970), p. 72; translated fr

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Pseudo-Aristotle, De Mundo, [https://archive.org/stream/worksofaristotle03arisuoft#page/n181/mode/2up/search/heavenly 399a]

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p. 188; also reported in various sources as:Friendship is a single soul dwelling in two bodies. A true friend is one soul in two bodies. Love is composed of a single soul inhabiting two bodies. What is a friend? A single soul dwelling in two bodies.

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p. 187