Tawheed is the key

Allah Ta’ala Swaer by Himself with his attributes, or His verses and His creations that shows that its a Big sign from the signs of Allah.

And Allah Subhanahu Wa Ta’ala swear by Himself 7 times in the Qur’an:

1-”The Unbelievers think that they will not be raised up (for Judgment). Say: “Yea, By my Lord, Ye shall surely be raised up: then shall ye be told (the truth) of all that ye did. And that is easy for Allah.” [64:7]

2-”The Unbelievers say, “Never to us will come the Hour”: Say, “Nay! but most surely, by my Lord, it will come upon you;- by Him Who knows the unseen,- from Whom is not hidden the least little atom in the heavens or on earth: Nor is there anything less than that, or greater, but is in the Record Perspicuous” [34:3]

3-”They seek to be informed by thee: “Is that true?” Say: “Aye! by my Lord! it is the very truth! and ye cannot frustrate it!”[10:53]

4-”So, by thy Lord, without doubt, We shall gather them together, and (also) the Evil Ones (with them); then shall We bring them forth on their knees round about Hell” [19:68]

5-”Therefore, by the Lord, We will, of a surety, call them to account” [15:92]

6-”But no, by the Lord, they can have no (real) Faith, until they make thee judge in all disputes between them, and find in their souls no resistance against Thy decisions, but accept them with the fullest conviction.” [4:65]

7-”Now I do call to witness the Lord of all points in the East and the West that We can certainly” [70:40]

And what Allah swears with in the rest of the Qur’an is by His creations, as in the verse:

“And by the sun and its brightness, And by the moon as it follows it (the sun)…..” [surat ash-shams from verse 1-7]

and His Saying:

“By the night as it envelops, And by the day as it appears in brightness, And by Him Who created male and female” [92:1-3]

and there are many of such examples in the qur’an, and Allah can swear by what He wants, but if the creations swear by other than Allah then thats shirk. theres a hadeeth that says:

“Whoever swears by anyone other than Allaah, has associated partners with Allaah“[Transmitted by Ahmad]

and the hadeeth narrated by Umar:

“Whoever swears by other than Allah has committed an act of kufr or Shirk.”

(Narrated by At-Tirmizi, who graded it as Hasan and by Al-Hakim, who graded it as Saheeh)

And when Allah swear by His creations, it leads to their Creator and that is Allaah Ta’ala, and its to show its virtues and benefits and for the people to learn from.

May Allah allow us to benefit from the Qur’an and its many blessings..

[Taken from the same book as the one i posted the example of the munafiqeen from]