God will surely know the believers and know the hypocrites.
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Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : (verily allah knoweth) he sees and distinguishes (those who believe) in private and openly, (and verily he knoweth) he sees and distinguishes (the hypocrites) on the day of badr.
Jalāl al-Dīn al-Maḥallī
تفسير : and god shall surely ascertain those who believe, in their hearts, and he shall surely ascertain the hypocrites, and he will requite each group accordingly (the lām in both verbs [la-ya‘lamanna, ‘he shall ascertain’] is for oaths).