Muhammad bin Ishaq narrated from his uncle Musa bin Yasar: It has reached me that Sayyiduna Salman (may Allah be pleased with him) wrote to Sayyiduna Abu Darda (may Allah be pleased with him): Knowledge is like springs upon which people come, and all of them draw from it, and many people benefit from it. And a hadith of wisdom that is not conveyed is like a body without a soul, and knowledge that is not spread is like a treasure from which nothing is spent. The example of a scholar is like that of a man who placed a lamp on a dark path, from which every passerby receives light, and every person prays good for him.
Hadith Referenceسنن دارمي / مقدمه / 576
Hadith Gradingتحقیق (حسین سلیم أسد الدارانی):إسناده ضعيف ابن إسحاق قد عنعن وهو مدلس، [مكتبه الشامله نمبر: 576]
Hadith Takhrijاس روایت کی سند ضعیف ہے۔ ابن اسحاق مدلس اور موسیٰ و سیدنا سلمان رضی اللہ عنہ کے درمیان انقطاع ہے۔ دیکھئے: [مصنف ابن أبي شيبه 16515]
Brief Explanation
(Explanation of Ahadith 573 to 576) «اختلج يختلج» To pull something out by drawing it.