Musannaf Ibn Abi Shaybah

Hazrat Saeed narrates that Qasamah also existed in the time of ignorance. The Noble Prophet (peace and blessings be upon him) maintained it regarding an Ansari who was found murdered in a well belonging to the Jews. The narrator says that the Noble Prophet (peace and blessings be upon him) started with the Jews and bound them to take fifty oaths. The Jews said, "We will never take an oath." Then the Noble Prophet (peace and blessings be upon him) said to the Ansar, "Will you take an oath?" The Ansar said, "We will never take an oath." So the Noble Prophet (peace and blessings be upon him) placed the blood money of the murdered person upon the Jews, because the murder had occurred among them.