How are they made to swear in the qasamah?

Ibn Jurayj said: I asked Ibn Shihab: Is swearing in a blood case based on knowledge, or is it categorical? He said: Categorical.

Ibn Sirin said that Shurayh stated concerning qasamah (the collective oath): Shall I make them sinners when I know? Meaning: Shall I make them swear: We did not kill, nor do we know the killer?

Al-Hasan bin Ubaydullah said that Ibrahim stated: Each man among them shall be made to swear: By Allah, I did not kill, nor do I know the killer. Then his blood money shall be paid.

Al-Shaybani said that al-Sha'bi said: A man was found dead in the area of Wadi'ah in Yemen. The matter was brought before Sayyiduna Umar (may Allah be pleased with him), and he made fifty of them swear in these words: "We did not kill him, nor do we know the killer." Then he paid the blood money of the slain man.

Hisham said that al-Hasan al-Basri said: In qasamah the oath by Allah is to be taken in these words: "We did not kill him, nor do we know the killer."

Al-Hasan al-Basri and Muhammad bin Sirin both said that Shurayh made those people swear in these words: "By Allah, we did not kill him, nor do we know the killer."