Allah's Messenger (may peace be upon him) related that Allah ordered Yahyaa Ibn Zakariyyah (may peace be upon him) with five commandments; to act upon them and convey them to the Children of Israel ... (the fifth one being): " ... and I order you to make mention of Allah often, as this is like a man being pursued at speed by the enemy until he reaches a protected fortress and so protects himself inside it, likewise is the servant, he can only protect himself from the shaytaan through the remembrance of Allah, the Mighty and the Majestic."
Source: Shaheeh Al-Jaami # 1724
