(153) باب فِي الْمُشْرِكِ يُسْهَمُ لَهُ
A'ishah said (this is the version of narrator Yahya). A man from the polytheists accompanied the Prophet (ﷺ) to fight along with him. He said "Go back. Both the narrators (Musaddad and Yahya) then agreed. The Prophet said "We do not want any help from a polytheist."
Reference: Sunan Abi Dawud 2732
In-book reference: Book 15, Hadith 256
English translation: Book 14, Hadith 2726