Malik related to me from Zayd ibn Aslam that the Messenger ofAllah, may Allah bless him and grant him peace, said, "Give to abeggar even if he comes on a horse." (JA)
USC-MSA web (English) reference: Book 58, Hadith 3 (JA)
Arabic reference (JA): Book 58, Hadith 1846 (JA)