Musnad Ahmad Hadith 17493

It is narrated from Abu Rimthah (may Allah be pleased with him) that I went with my father to the service of the Prophet (peace and blessings of Allah be upon him). I saw the effect of henna on the head of the Prophet (peace be upon him) and saw the Seal of Prophethood on his shoulder, the size of a pigeon’s egg. My father said, "O Messenger of Allah! (peace be upon him) Should I not treat you, for I am a physician?" The Prophet (peace be upon him) said, "Its physician is Allah, Who created it." Then he said, "Is this your son with you?" He said, "Yes." The Prophet (peace be upon him) said, "Remember! He is not responsible for any of your crimes, nor are you responsible for any of his crimes."