This was Jesus, son of Mary: A true account they contend about.
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Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : (such was jesus, son of mary) such was the event of jesus, son of mary: ((this is) a statement of the truth concerning which they doubt) i.e. the christians, for some of them said he is allah, and some said he was the son of allah and some of them claimed he was allah's partner.
Jalāl al-Dīn al-Maḥallī
تفسير : that is jesus, son of mary, a statement of truth (read qawlu’l-haqqi, as the predicate of an implied subject, in other words, ‘the statement of the son of mary [is a statement of truth]’; or read qawla’l-haqqi, because of [it being the object of] an implied [verb] qultu, ‘i say’, meaning, ‘[i say] a statement of truth’) concerning which they are in doubt (yamtarūna, derives from [the infinitive] al-mirya) — they are the christians, who say, ‘indeed jesus is the son of god’; [but] they lie.