It is narrated from Sayyiduna Umar bin al-Khattab (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "No earner has earned anything like the excellence of knowledge that guides its possessor to right guidance or saves him from ruin; and a person's religion does not become upright until his intellect becomes upright."
"No one other than his son Abd al-Rahman (may Allah have mercy on him) narrated this hadith from Zayd bin Aslam (may Allah have mercy on him), and Asbagh bin al-Faraj (may Allah have mercy on him) is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب العين / 4726
Hadith Gradingمحدثین:إسناده ضعيف لضعف عبد الرحمن بن زيد بن أسلم
Hadith Takhrij«قال الهيثمي: فيه عبد الرحمن بن زيد بن أسلم وهو ضعيف «مجمع الزوائد ومنبع الفوائد، ج 1، ص 121»» «أخرجه الطبراني فى «الصغير» برقم: 676»