Musannaf Ibn Abi Shaybah 32434 — Book of Faith

Sayyiduna Anas (may Allah be pleased with him) said that the Prophet (peace and blessings be upon him) said: "Near the Hour there will be many trials, like portions of the dark night, in which a man will begin the morning as a believer and reach the evening as a disbeliever, and begin the morning as a disbeliever and reach the evening as a believer."