Surah Al-'Adiyat 100:2
فَٱلْمُورِيَـٰتِ قَدْحًا
And the producers of sparks [when] striking
Translation: Saheeh International
Tafsir
by the strikers the steeds that strike fire by way of sparks with their hoofs when they gallop across rocky terrain by night;
Excerpt from Tafsir al-Jalalayn, commentary on 100:2, via Quran.com. The reader has the full commentary and 9 more tafsirs.