Musannaf Ibn Abi Shaybah 32359 — Book of Faith

Sayyiduna Ka'b (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) said: "The example of the believer is that of a tender, weak crop which the wind keeps moving: at one time it throws it down, and at another it sets it upright, until it dries up. And the example of the disbeliever is that of a pine tree standing firm on its roots: nothing can shake it, until it is uprooted all at once."