It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that Sayyiduna Abu Bakr al-Siddiq (may Allah be pleased with him) said to the Prophet (peace and blessings be upon him): Instruct me with words that I may recite in the morning and in the evening. So he (peace and blessings be upon him) said: "Say: 'Allahumma fatir as-samawati wal-ard, 'alim al-ghaybi wash-shahadah, rabba kulli shay'in wa malikah, ashhadu an la ilaha illa ant, a'udhu bika min sharri nafsi, wa min sharri ash-shaytani wa shirkih' (O Allah, Originator of the heavens and the earth, Knower of the unseen and the seen, Lord of everything and its Sovereign! I bear witness that there is no god but You. I seek refuge in You from the evil of my own self, and from the evil of Satan and his shirk (or his snares))." He (peace and blessings be upon him) said: "Recite them in the morning, in the evening, and when you go to your bed to sleep." This hadith has a sahih (authentic) chain, but the two Shaykhs (Bukhari and Muslim) did not record it.