It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that Sayyiduna Umar (may Allah be pleased with him) passed by Mu'adh bin Jabal (may Allah be pleased with him) while he was weeping. He asked: "Why are you weeping?" He said: "Because of a hadith I heard from the Messenger of Allah (peace and blessings be upon him): 'Indeed, even the least degree of showing off is shirk, and the most beloved of servants to Allah, the Mighty and Majestic, are those who are God-fearing and remain unknown; who, when they are absent, are not sought, and when they are present, are not recognised. They are the leaders of guidance and the lamps of knowledge.'" This hadith has a sahih (authentic) chain, but the two Shaykhs did not record it.