Zakat (Kitab Al-Zakat)

Dawud :: Book 9 : Hadith 1663

Narrated Umm Bujayd:

She took the oath of allegiance to the Apostle of Allah (peace_be_upon_him) and said to him: Apostle of Allah, a poor man stands at my door, but I find nothing to give him. The Apostle of Allah (peace_be_upon_him) said to her: If you do not find anything to give him, put something in his hand, even though it should be a burnt hoof.