Surah Al-Jinn 72:24

حَتَّىٰٓ إِذَا رَأَوْا۟ مَا يُوعَدُونَ فَسَيَعْلَمُونَ مَنْ أَضْعَفُ نَاصِرًا وَأَقَلُّ عَدَدًا

[The disbelievers continue] until, when they see that which they are promised, then they will know who is weaker in helpers and less in number.

Translation: Saheeh International

Tafsir

Such that when they see hattā is for inceptiveness but also entailing a purposive sense to an implied preceding clause that is to say they persist in their disbelief until they come to see … what they are promised of chastisement they will then know at the moment that it befalls them either on the day of Badr or on …

Excerpt from Tafsir al-Jalalayn, commentary on 72:24, via Quran.com. The reader has the full commentary and 9 more tafsirs.