﴿ وَلَيَعْلَمَنَّ ٱللَّهُ ٱلَّذِينَ ءَامَنُوا۟ وَلَيَعْلَمَنَّ ٱلْمُنَٰفِقِينَ ﴾

“[Yea-] and most certainly will God mark out those who have [truly] attained to faith, and most certainly will He mark out the hypocrites.”

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.