Sayyiduna Abu Hurayrah (may Allah be pleased with him) narrates from the Prophet (peace and blessings be upon him) that he (peace and blessings be upon him) said: "Allah has not been worshipped with anything better than understanding of the religion (fiqh). A single faqih is harder on Satan than a thousand worshippers. Everything has a pillar, and the pillar of this religion is fiqh (understanding of the religion)."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Safwan bin Sulaym except Yazid bin Iyad."
Hadith Referenceالمعجم الأوسط / باب الميم / 6166
Hadith Gradingمحدثین:إسناده ضعيف جدًّا، فيه يزيد بن عياض كذاب
Hadith Takhrij«قال الهيثمي: فيه يزيد بن عياض وهو كذاب «مجمع الزوائد ومنبع الفوائد، ج 1، ص 121»» «أخرجه الدارقطني فى «سننه» برقم: 3085، وابن حجر فى «المطالب العالية» برقم: 3087، 3088»