Hanzhalah ibn Hidhyam reported that his grandfather Haneefah said to Hidhyam: "Gather my children for me, because I want to leave a testament." When they were gathered, he said: "The first thing I bequeath is that this orphan of mine who is in my custody is entitled to one hundred camels, which were called Al-Mutayyabah (the good favored ones) in pre-Islamic times.'' Hidhyam said: "O my father, I heard your children say: 'We will approve of this during our father's life, but when he dies, we will recant it.'" He said: "So let the Messenger of Allah (may Allah's peace and blessings be upon him) judge between me and you." Hidhyam said: "We accept that." So Hidhyam, Haneefah, and Hanzhalah along with a young boy who escorted Hidhyam set forth. When they came to the Prophet (may Allah's peace and blessings be upon him) they greeted him. The Prophet (may Allah's peace and blessings be upon him): "What made you come, Abu Hidhyam?" He replied, having struck Hidhyam on the thigh: "I fear that old age or death will overtake me, so I wanted to make a bequest. I therefore said: 'The first thing I bequeath is that this orphan of mine who is in my custody is entitled to one hundred camels, which were called Al-Mutayyibah in pre-Islamic times.'" The Messenger of Allah (may Allah's peace and blessings be upon him) became so angry that we saw anger in his face. He was sitting, but he knelt down and said: "No, no, no! A charity should consist of five camels, or else ten, or else fifteen, or else twenty, or else twenty-five, or else thirty, or else thirty-five, or of a maximum of forty." They fared him well, and the orphan had a stick with him with which he was beating a camel. So the Prophet (may Allah's peace and blessings be upon him) noted: "That is a too big a stick for an orphan." Hanzhalah said: "My father drew me closer to the Prophet, may Allah's peace and blessings be upon him and said: 'I have sons with beards, and others younger than them, and this one is the youngest. So pray for him.'" Therefore, he wiped his head and said: "May Allah bless you," or: "May he be blessed." Dhayyāl said: "I have seen Hanzhalah, and a man with a swollen face or a beast with a swollen udder would be brought to him. He would spit on his hands and say "Bismillāh" (in the name of Allah); put his hand on his head, where the Messenger of Allah (may Allah's peace and blessings be upon him) had placed his hand; and then wipe [the affected part] with it." Dhayyāl said: "The tumor would disappear."
Authentic hadith - Narrated by Ahmad