(97) باب مَا يُؤْمَرُ مِنَ انْضِمَامِ الْعَسْكَرِ وَسِعَتِهِ
Sahl bin Mu'adh reported on the authority of his father "We fought along with the Prophet of Allaah(ﷺ). The rest of the tradition is to the same effect."
Reference: Sunan Abi Dawud 2630
In-book reference: Book 15, Hadith 154
English translation: Book 14, Hadith 2624