Majma al-Zawaid — Hadith 10315

In one report the words are: "What has become of those people whose stature is short, whose complexion is dark, and whose hair is curly?" I said: "O Messenger of Allah, they are allies of ours."
Ahmad and al-Tabarani recorded it; however, in place of the word "Ask something" they recorded the word "Keep travelling". Then he said: "What has become of those people whose complexion is dark, whose hair is curly, whose stature is short, and who have livestock in Shabakat Sharkh?" The narrator says: I tried to think of such people among Banu Ghifar, but they did not come to my mind, until it occurred to me that they are people belonging to the tribe of Aslam who had stayed behind. The Prophet (peace and blessings be upon him) said: "What prevented any one of them, when he stayed behind, from giving his camel as a mount to someone fresh and eager to take part in fighting in the path of Allah? Of my household, the most grievous thing to me is that the Muhajirun who belong to Quraysh, or anyone belonging to the Ansar, Aslam or Ghifar, should stay behind from me." The chain of both of these reports contains the nephew of Sayyiduna Abu Ruhm (may Allah be pleased with him), and I do not know him.