It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) (the narrator says: I know it only as narrated from the Prophet (peace and blessings be upon him)) that he (peace and blessings be upon him) said: "Whoever says, 'I am a scholar,' is ignorant."
This hadith is not narrated from the Messenger of Allah (peace and blessings be upon him) except with this chain, and Muhammad bin Kathir is alone in narrating it.
Hadith Referenceالمعجم الأوسط / باب الميم / 6846
Hadith Gradingمحدثین:إسناده ضعيف لضعف ليث بن أبي سليم
Hadith Takhrij«قال الهيثمي: فيه ليث بن أبي سليم وهو ضعيف «مجمع الزوائد ومنبع الفوائد، ج 1، ص 186»»