Surah Al-Muzzammil 73:17

فَكَيْفَ تَتَّقُونَ إِن كَفَرْتُمْ يَوْمًا يَجْعَلُ ٱلْوِلْدَٰنَ شِيبًا

Then how can you fear, if you disbelieve, a Day that will make the children white-haired?

Translation: Saheeh International

Tafsir

So if you disbelieve in this world how will you guard against a day yawman is the direct object of tattaqūna ‘you guard against’ that is against the chastisement thereof by what defence will you defend yourselves against the chastisement of a day that will make the children grey-haired shīb is the plural of ashyab by …

Excerpt from Tafsir al-Jalalayn, commentary on 73:17, via Quran.com. The reader has the full commentary and 9 more tafsirs.