Sayyiduna Abu Hilal al-Taymi (may Allah be pleased with him) narrates that he came to the Messenger of Allah (peace and blessings be upon him) concerning a man of his people, while he (peace and blessings be upon him) was in Madinah after his emigration there. We reached him (peace and blessings be upon him) and found him (peace and blessings be upon him) having the necks of captives struck beside a little water, and he was killed right there, until the blood spread over the water. (The narrator) Safwan said: "Safaha" means that it covered the water.
Hadith Referenceالمعجم الكبير للطبراني / مسند من يعرف بالكنى / 19151