Musannaf Ibn Abi Shaybah

It is narrated from Hazrat Amr bin Maymoon that Hazrat Umm Darda said to Hazrat Abu Darda: "If I become needy after you, can I eat from charity and zakat (by asking)?" He replied, "No, work and eat." She then asked, "If I become unable to work due to weakness, then what?" He replied, "Pick up the leftover ears of wheat, but do not eat from charity and zakat (by asking) under any circumstances."