Mishkat al-Masabih 3471
Abu Rimtha said:
I came to God’s Messenger with my father, and on his asking who this was along with him, he replied, “He is my son; be witness to the fact.” He said, “He will not bring evil on you, nor will you bring evil on him.”*

Abu Dawud and Nasa’i transmitted it. 

* This is explained as meaning that neither will be punished for the wrong done by the other.

In Sharh as-sunna there is an addition at the beginning. He said: I went in with my father to see God’s Messenger, and when my father saw what was on God's Messenger’s back he said, “Let me treat what is on your back, for I am a physician.” He replied, “You are the helper, but God is the Physician.”*

*i.e. you act in a gentle manner giving help and advice, but only God can cure.
وَعَن أبي رِمْثَةَ قَالَ: أَتَيْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مَعَ أبي فقالَ: «مَنْ هَذَا الَّذِي مَعَكَ؟» قَالَ: ابْنِي أَشْهَدُ بِهِ قَالَ: «أَمَا إِنَّهُ لَا يَجْنِي عَلَيْكَ وَلَا تَجْنِي عَلَيْهِ» . رَوَاهُ أَبُو دَاوُدَ وَالنَّسَائِيُّ وَزَادَ فِي «شَرْحِ السُّنَّةِ» فِي أَوَّلِهِ قَالَ: دَخَلْتُ مَعَ أَبِي عَلَى رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَرَأَى أَبِي الَّذِي بِظَهْرِ رَسُول الله صلى الله عَلَيْهِ وَسلم فَقَالَ: دَعْنِي أُعَالِجُ الَّذِي بِظَهْرِكِ فَإِنِّي طَبِيبٌ. فَقَالَ: «أَنْتَ رفيقٌ واللَّهُ الطبيبُ»