Majma al-Zawaid — Hadith 1568

Sayyiduna Abu Layla narrates: I was with the Prophet (peace and blessings be upon him), and on his chest (the narrator is in doubt; perhaps the words are:) on the stomach of the Prophet (peace and blessings be upon him) was Sayyiduna al-Hasan (may Allah be pleased with him), or perhaps Sayyiduna al-Husayn (may Allah be pleased with him). He urinated, and I saw the streaks of his urine. We moved towards the Prophet (peace and blessings be upon him), and he said: Leave my son! Do not disturb him until he finishes urinating. Then he poured water over it. Then he (peace and blessings be upon him) got up and entered the house in which the dates of charity (sadaqah) were kept, and that child was with him. He took a date and put it in his mouth, so the Prophet (peace and blessings be upon him) took it out and said: Charity is not lawful for us.
Imam Ahmad and Imam al-Tabarani in al-Mu'jam al-Kabir recorded it, and its narrators are thiqat (trustworthy).