Compassion
Middle English: via Old French from ecclesiastical Latin compassio(n- ), from compati ‘suffer with’.
wiktionary
From Middle English compassioun, compassion, from Old French compassion, from Ecclesiastical Latin compassio(“sympathy”), from Latin compati, past participle compassus(“to suffer together with”), from com-(“together”) + pati(“to suffer”); see passion.
etymonline
compassion (n.)
"feeling of sorrow or deep tenderness for one who is suffering or experiencing misfortune," mid-14c., compassioun, literally "a suffering with another," from Old French compassion "sympathy, pity" (12c.), from Late Latin compassionem (nominative compassio) "sympathy," noun of state from past participle stem of compati "to feel pity," from com "with, together" (see com-) + pati "to suffer" (see passion).
Latin compassio is an ecclesiastical loan-translation of Greek sympatheia (see sympathy). Sometimes in Middle English it meant a literal sharing of affliction or suffering with another. An Old English loan-translation of compassion was efenðrowung.
