It is narrated from Sayyiduna Anas (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) asked a man from the Arabs: "When a moment of hope or fear comes upon you, to whom do you turn for refuge?" He said: "To Allah." He (peace and blessings be upon him) said: "Then when He answers you, to whom do you return?" They said: "To that which you know." So he (peace and blessings be upon him) said: "You know but you do not act, and you act but you do not know." He (peace and blessings be upon him) said this three times.
Imam al-Tabarani (may Allah have mercy on him) said: "This hadith was narrated from Humayd only by Hammad bin Salamah, and from Hammad only by Mansur bin Suqayr."
Hadith Referenceالمعجم الأوسط / باب الميم / 5771
Hadith Gradingمحدثین:إسناده ضعيف لضعف منصور بن صقير
Hadith Takhrij«قال الهيثمي: رواه الطبراني في الأوسط وفيه منصور بن صقير وهو ضعيف وبقية رجاله ثقات «مجمع الزوائد ومنبع الفوائد، ج 10، ص 150»»