Knowing everything - (http://www.oxforddictionaries.com/definition/english/omniscient)
Do the core teachings of Islam, (e.g. those found in the Quran), say that God (Allah) is omniscient?
To clarify, I am looking for evidence of Allah's omniscience from Islam's core teachings.
This is somewhat related to another question of mine, although the two can not be equated: According to Islam, why was I born?