Surely your Lord in His wisdom will decide between them. He is all-mighty and all-knowing.
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Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : (lo! thy lord will judge between them) between the jews and christians (of his wisdom) by his judgement and decree on the day of judgement, (and he is the mighty) in retribution against them, (the knower) he knows them and knows their punishment.
Jalāl al-Dīn al-Maḥallī
تفسير : surely your lord will decide between them, as [he will] with others on the day of resurrection, of his judgement, that is, his justice. and he is the mighty, the victor, the knower, of what he judges, so that none will be able to oppose him in the way that the disbelievers have opposed his prophets in this world.