Allah Himself has testified to the fact that there is no god but Him and so do the angels and those who are well grounded in knowledge standing firm on justice. There is no God except Him, the Mighty, the Wise. (3:18)
The fact is that your Lord is the same Allah Who created the heavens and the earth in six Yome (time periods) and is firmly established on the Throne of authority, and is directing the affairs of the universe. None can intercede for you, except the one who receives His permission. This is Allah your Rabb (Lord), so worship Him: will you not receive admonition? (10:3)
To Him you shall all return. Allah’s promise is true. He is the One Who originates the process of Creation and repeats it (will bring back to life) so that He may justly reward those who believed in Him and did righteous deeds. As for those who disbelieved, they shall have boiling fluids to drink and shall undergo a painful punishment because they rejected the truth. (10:4)
It is He who made the sun a shining light and the moon a derived light and determined for it phases – that you may know the number of years and account [of time]. Allah created them only to manifest the truth. He has spelled out His revelations for people who want to understand. (10:5)
Indeed, in the alternation of the night and the day and [in] what Allah has created in the heavens and the earth are signs for those who are God fearing. (10:6)
Say: He is Allah the One and Only; (112:1)
Allah is the Self-Sufficient (independent of all, while all are dependent on Him); (112:2)
He begets not, nor is He begotten; (112:3)
And there is none comparable to Him. (112:4)
It is Allah who erected the heavens without pillars that you [can] see; then He established Himself above the Throne and made subject the sun and the moon, each running [its course] for a specified term. He arranges [each] matter; He details the signs that you may, of the meeting with your Lord, be certain. (13:2)
And it is He who spread the earth and placed therein firmly set mountains and rivers; and from all of the fruits He made therein two mates; He causes the night to cover the day. Indeed in that are signs for a people who give thought. (13:3)
And within the land are neighboring plots and gardens of grapevines and crops and palm trees, [growing] several from a root or otherwise, watered with one (same) water; but We make some of them exceed others in [quality of] fruit. Indeed in that are signs for a people who reason. (13:4)
Allah knows what every female bears in her womb. He is fully aware of what decrease or increase (miscarriage or a long wait) takes place in the womb. Everything has a due measure with Him. (13:8)
He has perfect knowledge of both the visible and the invisible. He is the Great, the Most High. (13:9)
It is the same (to Him) whether any of you speak in secret or aloud, whether anyone hides under the darkness of night or walks bout in broad daylight. (13:10)
(13:12) He is the One Who shows you lightning, which causes fear and hope, and brings up heavy clouds (with rain).
The thunder declares His glory with His praises and so do the angels with awe. He (is the One Who) sends thunderbolt and smites with them whomever He wants. Yet these (disbelievers) dispute concerning Allah; He is mighty in strength. (13:13)
To read more how Allah described Himself in Quran, you can visit www.quranicstories.com/who-is-allah/