Abu Dawud said "They were about ten persons. Six of them were killed and the remaining returned.
In-book : Book 15, Hadith 248
English translation : Book 14, Hadith 2718
15. Jihad (Kitab Al-Jihad)
باب فِيمَنْ جَاءَ بَعْدَ الْغَنِيمَةِ لاَ سَهْمَ لَهُ