Sayyiduna Abu Rimthah (may Allah be pleased with him) said: I came with my father to the Prophet (peace and blessings be upon him). My father saw (what was on) his (peace and blessings be upon him) back and said: I am a physician; let me treat this (thing) on your back (the Seal of Prophethood). He (peace and blessings be upon him) said: "You are not a physician; you are a rafiq (a gentle companion)." Then he (peace and blessings be upon him) said: "Who is this with you?" My father said: My son, and I swear to it. He (peace and blessings be upon him) said: "His offence will not be held against you, nor yours against him."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنايات / 15897