Abu al-Hawra' (may Allah have mercy on him) said: I said to Sayyiduna Hasan bin Ali (may Allah be pleased with him): What do you remember of the Messenger of Allah (peace and blessings be upon him)? He said: I remember of the Messenger of Allah (peace and blessings be upon him) that I took a date from the dates of sadaqah (charity) and put it in my mouth, and the Messenger of Allah (peace and blessings be upon him) took it out with its saliva and put it back among the dates. It was said: O Messenger of Allah, what harm would this one date have done to this child? He (peace and blessings be upon him) said: "Sadaqah is not lawful for us, the family of Muhammad."
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 2697