﴿ يَٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوا۟ ٱذْكُرُوا۟ نِعْمَةَ ٱللَّهِ عَلَيْكُمْ إِذْ جَآءَتْكُمْ جُنُودٌۭ فَأَرْسَلْنَا عَلَيْهِمْ رِيحًۭا وَجُنُودًۭا لَّمْ تَرَوْهَا ۚ وَكَانَ ٱللَّهُ بِمَا تَعْمَلُونَ بَصِيرًا ﴾

“O YOU who have attained to faith! Call to mind the blessings which God bestowed on you (at the time) when [enemy] hosts came down upon you, where­upon We let loose against them a storm wind and [heavenly] hosts that you could not see: yet God saw all that you did.”

O you who believe! Remember God’s favour to you when hosts of disbelievers came against you as confederates at the time the Ditch al-khandaq was being dug and We unleashed against them a great wind and hosts of angels you did not see. And God is ever Seer of what you do read ta‘malūna to imply ‘in the way of your digging of the ditch’; or read ya‘malūna ‘of what they do’ to imply ‘the idolaters’ forming of a confederation’.