An Ansari companion narrates that the Messenger of Allah (peace be upon him) maintained Qasamah in the same manner as it was in the pre-Islamic era.

Sayyiduna Sahl bin Abi Hathmah رضي الله عنه narrates that Abdullah bin Sahl was found murdered or dead in a well or pit in Khaybar. His two paternal uncles and his brother Abdur Rahman bin Sahl, who had also participated in the Battle of Badr, came to the Messenger of Allah صلى الله عليه وسلم. His brother Abdur Rahman began to speak, but the Prophet صلى الله عليه وسلم said: Let the elder speak. So Muhayyisah spoke and said: O Messenger of Allah! We found Abdullah murdered in a well in Khaybar. The Prophet صلى الله عليه وسلم said: Fifty men from among you should swear oaths that the Jews killed him. They said: How can we swear an oath about something we did not see? The Prophet صلى الله عليه وسلم said: Then the Jews will swear fifty oaths and be acquitted of the charge. They said: How can we accept their oaths when they are polytheists? Ibn Maqri says: In one narration, it is mentioned that the Prophet صلى الله عليه وسلم said: The Jews will swear fifty oaths and be acquitted from you, that they neither killed him nor do they know the killer. They said: How can we accept the oaths of polytheists? He said: Then fifty men from among you should swear oaths that they (the Jews) killed him. They said: How can we swear without having seen it? So the Messenger of Allah صلى الله عليه وسلم paid the blood money from his own side. One of the she-camels among them kicked me on the leg.

Abu Layla bin Abdullah bin Abdur Rahman narrates from the elders of his tribe that Abdullah bin Sahal and Muhayyisa set out towards Khaybar due to some calamity. Then someone came to Muhayyisa and informed him that Abdullah bin Sahal had been killed and thrown into a pit or a spring. He (Muhayyisa) went to the Jews and said: By Allah! You have killed him. They said: By Allah! We did not kill him. Then he returned to his people and informed them of the incident. Then he, his elder brother Huwayyisa, and Abdur Rahman bin Sahal (came to the Messenger of Allah, peace and blessings be upon him). Muhayyisa, who was in Khaybar, began to speak, so the Messenger of Allah, peace and blessings be upon him, said to Muhayyisa: Let the elder speak. Huwayyisa spoke, and afterwards Muhayyisa spoke. The Messenger of Allah, peace and blessings be upon him, said: Either they will pay the blood money for your companion or be prepared for war. The Messenger of Allah, peace and blessings be upon him, wrote to them about this, and they replied in writing: By Allah! We did not kill him. So the Messenger of Allah, peace and blessings be upon him, said to Huwayyisa, Muhayyisa, and Abdur Rahman: Can you swear an oath and thus become entitled to your companion’s blood? They said: No! He said: Then let the Jews swear oaths for you. They said: They are not Muslims. The Messenger of Allah, peace and blessings be upon him, paid the blood money from his own side. The Messenger of Allah, peace and blessings be upon him, sent one hundred camels to them until they were brought into their house. Sahal narrates: One of those red she-camels kicked me.

Sayyiduna Sahl bin Abi Hathmah and Sayyiduna Rafi’ bin Khadij (may Allah be pleased with them) narrate that Abdullah bin Sahl and Muhayyisah bin Mas’ud set out towards Khaybar for some need, and in its orchard they separated from each other. Abdullah bin Sahl was killed. Then his brother Abdur Rahman bin Sahl and two sons of his uncle, Huwayyisah and Muhayyisah bin Mas’ud, came to the Prophet (peace and blessings of Allah be upon him). Abdur Rahman bin Sahl began to speak, but the Messenger of Allah (peace and blessings of Allah be upon him) said: Let the elder speak. He (peace and blessings of Allah be upon him) was saying: Let the elder begin to speak. Abdur Rahman was the youngest of them. So they spoke about the killing of their companion. The Messenger of Allah (peace and blessings of Allah be upon him) said: Fifty men from among you should swear oaths and become entitled to the blood money of your companion or the slain. They said: How can we swear oaths when we were not present there? He said: Then fifty men from among the Jews will swear oaths and be acquitted from you. They said: But they are disbelieving people. The Messenger of Allah (peace and blessings of Allah be upon him) paid the blood money. Sahl says: I caught one of the she-camels from among those camels, and it kicked me in the enclosure.