Musannaf Ibn Abi Shaybah

Hazrat Iyas bin Salamah (may Allah have mercy on him) narrates that his father, Hazrat Salamah (may Allah have mercy on him), said: We launched a military expedition against the tribe of Hawazin along with Hazrat Abu Bakr (may Allah be pleased with him). We reached their water sources and spent the night there. We killed nine or seven of the residents who were staying there.