Today's verse

بِسْمِ اللّهِ الرَّحْمَنِ الرَّحِيْم

Surah 100

Al-'Adiyaat

Those that run

ﺳﻮﺭﺓ ﺍﻟﻌَﺎﺩﯾَﺎﺕ
Verse  2

Arabic:

ﻓَﺎﻟْﻤُﻮﺭِﻳَﺎﺕِ ﻗَﺪْﺣًﺎ

Transliteration:

Fal muuriyaati qadhan

(The 'h' in 'qadhan' is for ْﺤًﺎ and not ﻫ, so let's pronounce it as if we want to breath out air from our mouth).

Meaning:

2. Striking sparks of fire (by their hooves).

Tafsir

The expression  (ﻓَﺎﻟْﻤُﻮﺭِﻳَﺎﺕِﻗَﺪْﺣًﺎ) "Striking sparks of fire" has been interpreted in various ways.

Some say it means the sparks coming out of the hooves when they strike the rocky surface of earth.
Another view is that it means the raging fire of battle.

Another interpretation is war tactics.

Still another opinion is that it refers to lightning fire by the riders after returning to their camps or by the pilgrims after their arriving in Muzdalifah after sunset.

I prefer the view that it refers to the horses galloping in the cause of Allah.

Abu Bakr Bazzar quoted a Hadith that the Prophet (SAW) once despatched a calvary. A full month passed but no news came to the Prophet (SAW), then this revelation came to inform the Prophet that the galloping horse riders attacked the enemy in the morning and routed them.

Tafsir Ibn Kathir