Umar bin Khattab, may Allah be pleased with him, narrates from the Prophet, peace and blessings be upon him, that he said: "I fear for this Ummah every hypocrite, because he speaks with wisdom but acts with oppression." Imam Bayhaqi has narrated all three hadiths in Shu'ab al-Iman. Hasan, narrated by al-Bayhaqi in Shu'ab al-Iman.