Musannaf Ibn Abi Shaybah 32984 — Those who used to make bequests

Al-Qasim bin Amr said: My father fell ill, and I met Thumamah bin Hazn al-Qushayri, who asked me: "Has your father made a bequest?" I said: "No!" He said: "If you are able to have him make a bequest, then have him do so, for a bequest makes up for the shortfall in one's zakah."