Abbott-Smith Manual Greek Lexicon
ἰσόψυχος (G2473)
1 ἰσόψυχος -ον ( ἴσος , ψυχή ), [in LXX: Ps 54(55):13 ( כְּעֶרְכִּי )*;] of equal spirit (Æsch., Agam. , 1470). like-minded : Phl 2:20 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain