Muwatta Imam Malik (Riwayat Yahya)

It is narrated from a freed slave of the Quraysh, who was called Ibn Musa, that he said: I was sitting with Sayyiduna Umar ibn Khattab (may Allah be pleased with him), after he had performed the Zuhr prayer, and he said to Yarfa (the slave of Sayyiduna Umar, may Allah be pleased with him): Bring me my book, the book which he had written regarding the inheritance of the paternal aunt (Sayyiduna Umar, may Allah be pleased with him, had, according to his own opinion, allotted inheritance for the paternal aunt, reasoning that since the nephew inherits from the aunt, she should also inherit from him). So we asked the people and consulted them (after consultation, it became clear that the paternal aunt does not inherit). Then Sayyiduna Umar (may Allah be pleased with him) called for a bowl or a cup in which there was water, and he washed that book, and said: If Allah had intended to give a share to the paternal aunt, He would have mentioned it in His Book.

Sayyiduna Umar (may Allah be pleased with him) used to say that it is astonishing that a paternal aunt's nephew becomes an heir, but a nephew's paternal aunt does not become an heir.