(Quran 67:12~15)

As for those who fear their Lord in secret—
for them is forgiveness and a great reward.
Whether you keep your words secret, or declare them—He is Aware of the inner thoughts.
Would He not know, He Who created ?
He is the Refined, the Expert.
It is He who made the earth manageable for you,
so travel its regions, and eat of His provisions.
To Him is the Resurgence.

Al-Mulk (Arabic: الملك, “Sovereignty, Kingdom”) is the 67th chapter (surah) of the Quran, comprising 30 verses

إِنَّ ٱلَّذِينَ يَخْشَوْنَ رَبَّهُم بِٱلْغَيْبِ لَهُم مَّغْفِرَةٌۭ وَأَجْرٌۭ كَبِيرٌۭ ‎
‏‏وَأَسِرُّوا۟ قَوْلَكُمْ أَوِ ٱجْهَرُوا۟ بِهِۦٓ ۖ
إِنَّهُۥ عَلِيمٌۢ بِذَاتِ ٱلصُّدُورِ ‎
‎‏أَلَا يَعْلَمُ مَنْ خَلَقَ وَهُوَ ٱللَّطِيفُ ٱلْخَبِيرُ ‎
‏هُوَ ٱلَّذِى جَعَلَ لَكُمُ ٱلْأَرْضَ ذَلُولًۭا فَٱمْشُوا۟ فِى مَنَاكِبِهَا وَكُلُوا۟ مِن رِّزْقِهِۦ ۖ وَإِلَيْهِ ٱلنُّشُورُ

It talks about the greatness of Allah and beautiful universe that He has created. It reminds people that if they consider the laws of universe and travel in the land with open eyes, they will indeed see that this whole kingdom belongs to Allah and He controls everything.
Surah al-Mulk takes its name from the first Ayat, تَبَارَكَ الَّذِي بِيَدِهِ الْمُلْكُ وَهُوَ عَلَىٰ كُلِّ شَيْءٍ قَدِيرٌ “Blessed is He in whose hand is dominion, and He is over all things competent -” [67:1].