It is narrated from Sayyiduna Zayd bin Thabit (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "May Allah have mercy on a person who heard my words and then conveyed them onward, for many a bearer of knowledge is not himself a jurist, and many a bearer of knowledge carries it to one who has greater understanding than he."
Hadith Referenceالمعجم الكبير للطبراني / باب الزاي / 4905