Musnad Abu Ya'la al-Mawsili 6:33

Abu Khaythama narrated to us, Abd al-Samad ibn Abd al-Warith narrated to us, Aban narrated to us, Asim narrated to us, from Mus'ab ibn Sa'd, from his father, who said: I came to the Messenger of Allah, may Allah bless him and grant him peace, and he had some leftover food. The Messenger of Allah, may Allah bless him and grant him peace, said: "A man from the people of Paradise will emerge upon you from this mountain pass, eating this leftover." He said: I passed by Umayr ibn Malik while he was performing ablution, and I said to myself, "He is the one." We began to crane our necks to see who would emerge upon us. Then Abdullah ibn Salam emerged upon the Messenger of Allah, may Allah bless him and grant him peace. He called him for the leftover, and he ate it.