An-Nisa 4:176 يستفتونك قل الله يفتيكم في الكلالة ان امرو هلك ليس له ولد وله اخت فلها نصف ما ترك وهو يرثها ان لم يكن لها ولد فان كانتا اثنتين فلهما الثلثان مما ترك وان كانوا اخوة رجالا ونساء فللذكر مثل حظ الانثيين يبين الله لكم ان تضلوا والله بكل شيء عليم ١٧٦

They ask thee for a legal decision. Say: Allah directs (thus) about those who leave no descendants or ascendants as heirs. If it is a man that dies, leaving a sister but no child, she shall have half the inheritance: If (such a deceased was) a woman, who left no child, Her brother takes her inheritance: If there are two sisters, they shall have two-thirds of the inheritance (between them): if there are brothers and sisters, (they share), the male having twice the share of the female. Thus doth Allah make clear to you (His law), lest ye err. And Allah hath knowledge of all things.