Surah Al-Hadid (The Iron), Verse 25

لَقَدْ اَرْسَلْنَا رُسُلَنَا بِالْبَیِّنٰتِ وَاَنْزَلْنَا مَعَهُمُ الْكِتٰبَ وَالْمِیْزَانَ لِیَقُوْمَ النَّاسُ بِالْقِسْطِ وَاَنْزَلْنَا الْحَدِیْدَ فِیْهِ بَاْسٌ شَدِیْدٌ وَّمَنَافِعُ لِلنَّاسِ وَلِیَعْلَمَ اللّٰهُ مَنْ یَّنْصُرُهٗ وَرُسُلَهٗ بِالْغَیْبِ اِنَّ اللّٰهَ قَوِیٌّ عَزِیْزٌ 

Laqad arsalnaa Rusulanaa bilbaiyinaati wa anzalnaa ma'ahumul Kitaaba wal Meezaana liyaqooman naasu bilqist, wa anzalnal hadeeda feehi baasun shadeedunw wa manaafi'u linnaasi wa liya'lamal laahu many yansuruhoo wa Rusulahoo bilghaib; innal laaha Qawiyyun 'Azeez

“We sent aforetime our messengers with Clear Signs and sent down with them the Book and the Balance (of Right and Wrong), that men may stand forth in justice; and We sent down Iron, in which is (material for) mighty war, as well as many benefits for mankind, that Allah may test who it is that will help, Unseen, Him and His messengers: For Allah is Full of Strength, Exalted in Might (and able to enforce His Will).”

Quran 57:25 (Yusuf Ali Translation)