Allah's omniscience (knowledge of seen and unseen)

وَهُوَ ٱلَّذِى خَلَقَ ٱلسَّمَـٰوَٰتِ وَٱلْأَرْضَ بِٱلْحَقِّ ۖ وَيَوْمَ يَقُولُ كُن فَيَكُونُ ۚ قَوْلُهُ ٱلْحَقُّ ۚ وَلَهُ ٱلْمُلْكُ يَوْمَ يُنفَخُ فِى ٱلصُّورِ ۚ عَـٰلِمُ ٱلْغَيْبِ وَٱلشَّهَـٰدَةِ ۚ وَهُوَ ٱلْحَكِيمُ ٱلْخَبِيرُ

And it is He who created the heavens and earth in truth. And the day [i.e., whenever] He says, "Be," and it is, His word is the truth. And His is the dominion [on] the Day the Horn is blown. [He is] Knower of the unseen and the witnessed; and He is the Wise, the Aware.