It is narrated from Sayyiduna Sa'd bin Abi Waqqas (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "May Allah keep radiant the servant who heard my saying and remembered it, for many who carry knowledge of the religion are not themselves people of insight (fuqaha'), and many who carry knowledge convey it to someone who has more understanding than they."
Imam al-Tabarani (may Allah have mercy on him) said: "This hadith is not narrated from Sayyiduna Sa'd (may Allah be pleased with him) except with this chain, and Abu Mu'adh al-Nahwi (may Allah have mercy on him) is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الميم / 7020
Hadith Gradingمحدثین:فيه سعيد بن عبد الله لم يُعرف
Hadith Takhrij«قال الهيثمي: وفيه سعيد بن عبد الله لم أر من ذكره «مجمع الزوائد ومنبع الفوائد، ج 1، ص 139»»