Imam al-Shafi'i (may Allah have mercy on him) said: "And I do not know of any opponent regarding the fact that the 'aqilah means the 'asabah (paternal male relatives), and they are the relatives from the father's side."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الديات / Q16371
Sayyiduna Jabir (may Allah be pleased with him) says that two women of Hudhayl fought with each other and one of them killed the other. Each of them had a husband and a son. So the Prophet (peace and blessings be upon him) placed the blood money (diyah) of the slain woman upon the paternal kin ('asabah) of the woman who killed her, and he declared her husband and son free of it. The 'aqilah (paternal kin) of the slain woman said: "Her inheritance will come to us." So he (peace and blessings be upon him) said: "Her inheritance belongs to her husband and son." That slain woman was pregnant, and her child also miscarried. The paternal kin of the killer feared that they would have to pay blood money for it as well, so they said: "It neither ate, nor drank, nor spoke, nor cried out." So he (peace and blessings be upon him) said: "These are the words of the Jahiliyyah." Then he (peace and blessings be upon him) ruled that a male or female slave be given for that child as well.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الديات / 16373
Amr bin Shu'ayb narrates from his father, and he from his grandfather (may Allah be pleased with him), that he (peace and blessings be upon him) ruled: "The blood money owed by a woman is borne among her paternal kin ('asabah), whoever they may be, who do not inherit anything from her except what remains after her heirs. And if she is killed, her blood money is divided among her heirs, and they may kill her killer."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الديات / 16375
Sayyiduna Ibn Abbas (may Allah be pleased with him) narrates from the Prophet (peace and blessings be upon him) (through a man whom Abd al-Razzaq named Amr bin Barq): "A woman's blood money is paid by her paternal kin ('asabah), who take only what remains (after her heirs)."
Imam al-Shafi'i (may Allah have mercy on him) says that Sayyiduna Umar (may Allah be pleased with him) placed the blood money for the freed slaves of Sayyidah Safiyyah bint Abd al-Muttalib (may Allah be pleased with her) upon Sayyiduna Ali (may Allah be pleased with him), and declared Sayyiduna Zubayr (may Allah be pleased with him), who was her son, entitled to their inheritance.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الديات / 16376
Ibrahim (al-Nakha'i) (may Allah have mercy on him) says that Sayyiduna Zubayr and Sayyiduna Ali (may Allah be pleased with them both) brought a dispute before Sayyiduna Umar bin al-Khattab (may Allah be pleased with him) concerning the freed slaves of Safiyyah. He ruled the inheritance for Zubayr and the blood money upon Ali (may Allah be pleased with them both).
It is mentioned from al-Hasan that Umar said to Ali (may Allah be pleased with them both), concerning an offence that Umar (may Allah be pleased with him) had committed: "I adjure you to divide the blood money among the sons of your father." He said: So he divided it among Quraysh.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الديات / 16377
Ibn al-Musayyib (may Allah have mercy on him) and the other jurists of Madinah (may Allah have mercy on them) used to say: When a woman bears children among a people other than her own, her sons inherit from her and her own people pay her blood money; and her freed slave is in the same position.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الديات / 16378