Surah Al-Anbiya' (The Prophets), Verse 47

وَنَضَعُ الْمَوَازِیْنَ الْقِسْطَ لِیَوْمِ الْقِیٰمَةِ فَلَا تُظْلَمُ نَفْسٌ شَیْـًٔا وَاِنْ كَانَ مِثْقَالَ حَبَّةٍ مِّنْ خَرْدَلٍ اَتَیْنَا بِهَا وَكَفٰی بِنَا حٰسِبِیْنَ ۟

Wa nada'ul mawaazeenal qista li Yawmil Qiyaamati falaa tuzlamu nafsun shai'aa; wa in kaana misqaala habbatim min khardalin atainaa bihaa; wa kafaa binaa haasibeen

“We shall set up scales of justice for the Day of Judgment, so that not a soul will be dealt with unjustly in the least, and if there be (no more than) the weight of a mustard seed, We will bring it (to account): and enough are We to take account.”

Quran 21:47 (Yusuf Ali Translation)