Sura al-Anbiyāʾ 21:47

وَنَضَعُ ٱلْمَوَٰزِينَ ٱلْقِسْطَ لِيَوْمِ ٱلْقِيَٰمَةِ فَلَا تُظْلَمُ نَفْسٌ شَيْـًٔا وَإِن كَانَ مِثْقَالَ حَبَّةٍ مِّنْ خَرْدَلٍ أَتَيْنَا بِهَا وَكَفَىٰ بِنَا حَٰسِبِينَ

wa-naḍaʿu l-mawāzīna l-qisṭa li-yawmi l-qiyāmati fa-lā tuẓlamu nafsun shayʾan wa-in kāna mithqāla ḥabbatin min khardalin ataynā bihā wa-kafā binā ḥāsibīna

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.