‘Ubaydullah ibn ‘Amr reported: We were with Al-A’mash, may Allah have mercy on him, while he was asking Abu Hanifa about legal issues and Abu Hanifa answered him. Al-A’mash said to him, “From where did you get this?” Abu Hanifa said, “You narrated to us from Ibrahim as such. You narrated to us from Al-Sha’bi as such.” Al-A’mash said at that, “O scholars of Fiqh, you are the doctors and we are the pharmacists.”
Source: Naṣīḥat Ahl al-Ḥadīth 26
عن عُبَيْد اللَّهِ بْن عَمْرٍو قَالَ كُنَّا عِنْدَ الْأَعْمَشِ رحمه الله وَهُوَ يَسْأَلُ أَبَا حَنِيفَةَ عَنْ مَسَائِلَ وَيُجِيبُهُ أَبُو حَنِيفَةَ فَيَقُولُ لَهُ الْأَعْمَشُ مِنْ أَيْنَ لَكَ هَذَا فَيَقُولُ أَنْتَ حَدَّثْتَنَا عَنْ إِبْرَاهِيمَ بِكَذَا وَحَدَّثْتَنَا عَنِ الشَّعْبِيِّ بِكَذَا فَكَانَ الْأَعْمَشُ عِنْدَ ذَلِكَ يَقُولُ يَا مَعْشَرَ الْفُقَهَاءِ أَنْتُمُ الْأَطِبَّاءُ وَنَحْنُ الصَّيَادِلَةُ
26 نصيحة أهل الحديث للخطيب البغدادي