Ibn A'idh said: Sayyiduna Sa'd bin al-Midhas (may Allah be pleased with him) narrated from the Prophet (peace and blessings be upon him) that he (peace and blessings be upon him) said: "Whoever acquires some knowledge, let him not conceal it. Whoever's eyes shed tears out of fear of Allah, it will never be permissible for him to enter Hell, except to fulfil the oath of the Most Merciful. And whoever lies about me, let him take up his house in Hell."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 5481