...made the Night and the Day as two (of Our) Signs...

We have made the Night and the Day as two (of Our) Signs: the Sign of the Night have We obscured, while the Sign of the day We have made to enlighten you; that ye may seek bounty from your Lord, and that ye may know the number and count of the years: all things have We explained in detail. (12)

Quran: Chapter (17) Al-Isra, Verse 12.

have they partners, who have established for them some religion without the permission of Allah?

What! have they partners (in godhead), who have established for them some religion without the permission of Allah? Had it not been for the Decree of Judgement the matter would have been decided between them (at once): But verily the wrongdoers will have a grievous Penalty. (21)

Quran: Chapter (42) Ash-Shura, Verse 21

He (Allâh) has ordained for you the same religion... establish religion

He (Allâh) has ordained for you the same religion (Islâmic Monothesim)

which He ordained for Nûh (Noah),

and that which We have revealed to you (O Muhammad SAW),

and that which We ordained for Ibrahîm (Abraham), Mûsa (Moses) and 'Īsā (Jesus) saying you should establish religion (i.e. to do what it orders you to do practically),

and make no divisions in it (religion) (i.e. various sects in religion).

Intolerable for the Mushrikûn , is that (Islâmic Monothesim) to which you (O Muhammad SAW) call them.

Allâh chooses for Himself whom He wills, and guides unto Himself who turns to Him in repentance and in obedience. (13)

Quran: Chapter (42) Ash-Shura, Verse 13

none can change His Words...

And recite (and teach) what has been revealed to thee of the Book of thy Lord: none can change His Words, and none wilt thou find as a refuge other than Him. (27)

Quran: Chapter: 18, Verse 27

.... call you upon Allah making worship pure for Him ...

It is He, Who shows you His Ayât (proofs, evidences, verses, lessons, signs, revelations, etc.) and sends down (rain with which grows) provision for you from the sky. And none remembers but those who turn (to Allâh in obedience and) in repentance (by begging His Pardon and by worshipping and obeying Him Alone and none else). (13)

So, call you (O Muhammad SAW and the believers) upon (or invoke) Allâh making (your) worship pure for Him (Alone) (by worshipping none but Him and by doing religious deeds sincerely for Allâh's sake only and not to show off and not to set up rivals with Him in worship). however much the disbelievers (in the Oneness of Allâh) may hate (it). (14)

(He is Allâh) Owner of High Ranks and Degrees, the Owner of the Throne. He sends the revelation by His Command to any of His slaves He wills, that he (the person who receives revelation) may warn (men) of the Day of Mutual Meeting (i.e. The Day of Resurrection). (15)

The Day when they will (all) come out, nothing of them will be hidden from Allâh. Whose is the kingdom this Day? (Allâh Himself will reply to His Question): It is Allâh's the One, the Irresistible! (16)

This Day shall every person be recompensed for what he earned. This day no injustice (shall be done to anybody). Truly, Allâh is Swift in reckoning. (17)

Quran: Chapter: 40, Verses 13 - 17.

and to Him we have submitted

Say (O Muslims),

"We believe in Allâh and that which has been sent down to us

and that which has been sent down to Ibrâhim (Abraham), Ismâ'il (Ishmael), Ishâq (Isaac), Ya'qûb (Jacob),

and to Al-Asbât [the offspring twelve sons of Ya'qûb (Jacob)],

and that which has been given to Mûsa (Moses) and Isâ (Jesus),

and that which has been given to the Prophets from their Lord.

We make no distinction between any of them,

and to Him we have submitted (in Islâm)." (136)

Quran: Chapter: 2 - Verse 136.

...the Book confirming what went before it...

In the name of Allah, the Beneficent, the Merciful

Alif Lam Mim (1)

Allah! There is no Allah but He―the Living, the Self-Subsisting Eternal. (2)

It is He Who sent down to thee (step by step), in truth, the Book confirming what went before it; and He sent down the Torah (Of Moses) and the Gospel (of Jesus) (3)

Before this as a guide to mankind, and He sent down the Criterion (of judgment between right and wrong). Then those who reject Faith in the Signs of Allah will suffer the severest chastisement and Allah is Exalted in Might, Lord of Retribution. (4)

From Allah, verily nothing is hidden on earth or in the heavens. (5)

Quran: Chapter: 3 - Verses 1-5.

... in the universe, and in their own selves ...

We will show them Our Signs in the universe, and in their own selves, until it becomes manifest to them that this (the Qur'ân) is the truth. Is it not sufficient in regard to your Lord that He is a Witness over all things? (53)

Verily, they are in doubt concerning the Meeting with their Lord? (i.e. Resurrection after their death, and their return to their Lord). Verily! He it is Who is surrounding all things! (54)

Quran: chapter 41
Ayah: 53-54