Surah An-Nisa' (The Women), Verse 12

وَلَكُمْ نِصْفُ مَا تَرَكَ اَزْوَاجُكُمْ اِنْ لَّمْ یَكُنْ لَّهُنَّ وَلَدٌ فَاِنْ كَانَ لَهُنَّ وَلَدٌ فَلَكُمُ الرُّبُعُ مِمَّا تَرَكْنَ مِنْ بَعْدِ وَصِیَّةٍ یُّوْصِیْنَ بِهَاۤ اَوْ دَیْنٍ وَلَهُنَّ الرُّبُعُ مِمَّا تَرَكْتُمْ اِنْ لَّمْ یَكُنْ لَّكُمْ وَلَدٌ فَاِنْ كَانَ لَكُمْ وَلَدٌ فَلَهُنَّ الثُّمُنُ مِمَّا تَرَكْتُمْ مِّنْ بَعْدِ وَصِیَّةٍ تُوْصُوْنَ بِهَاۤ اَوْ دَیْنٍ وَاِنْ كَانَ رَجُلٌ یُّوْرَثُ كَلٰلَةً اَوِ امْرَاَةٌ وَّلَهٗۤ اَخٌ اَوْ اُخْتٌ فَلِكُلِّ وَاحِدٍ مِّنْهُمَا السُّدُسُ فَاِنْ كَانُوْۤا اَكْثَرَ مِنْ ذٰلِكَ فَهُمْ شُرَكَآءُ فِی الثُّلُثِ مِنْ بَعْدِ وَصِیَّةٍ یُّوْصٰی بِهَاۤ اَوْ دَیْنٍ غَیْرَ مُضَآرٍّ وَصِیَّةً مِّنَ اللّٰهِ وَاللّٰهُ عَلِیْمٌ حَلِیْمٌ ۟

Wa lakum nisfu maa taraka azwaajukum il lam yakul lahunna walad; fa in kaana lahunna waladun falakumur rub'u mimmaa tarakna mim ba'di wasiyyatiny yooseena bihaaa aw dayn; wa lahunnar rubu'u mimmaa taraktum il lam yakul lakum walad; fa in kaana lakum waladun falahunnas sumunu mimmaa taraktum; mim ba'di wasiyyatin toosoona bihaaa aw dayn; wa in kaana rajuluny yoorasu kalaalatan awim ra atunw wa lahooo akhun aw ukhtun falikulli waahidim minhumas sudus; fa in kaanooo aksara min zaalika fahum shurakaaa'u fissulus; mim ba'di wasiyyatiny yoosaa bihaaa aw dainin ghaira mudaaarr; wasiyyatam minal laah; wallaahu 'Aleemun Haleem

“In what your wives leave, your share is a half, if they leave no child; but if they leave a child, ye get a fourth; after payment of legacies and debts. In what ye leave, their share is a fourth, if ye leave no child; but if ye leave a child, they get an eighth; after payment of legacies and debts. If the man or woman whose inheritance is in question, has left neither ascendants nor descendants, but has left a brother or a sister, each one of the two gets a sixth; but if more than two, they share in a third; after payment of legacies and debts; so that no loss is caused (to any one). Thus is it ordained by Allah; and Allah is All-knowing, Most Forbearing.”

Quran 4:12 (Yusuf Ali Translation)