This is the truth from your Lord, so do not be in doubt.
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Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : ((this is) the truth) this is the true fact (from your lord) that jesus was not allah, his son or his partner, (so be not thou of those who waver) those who doubt what i have exposited to you regarding the creation of jesus without a father.
Jalāl al-Dīn al-Maḥallī
تفسير : the truth is from your lord (al-haqqu min rabbik, the predicate of a missing subject, which is [implied to be] amr ‘Īsā [‘the matter concerning jesus’]); be not of those who waver, those who are uncertain about it.