Chapter 2, Verse 138, The Cow
سُوۡرَةُ البَقَرَة
صِبۡغَةَ ٱللَّهِ وَمَنۡ أَحۡسَنُ مِنَ ٱللَّهِ صِبۡغَةٗۖ وَنَحۡنُ لَهُۥ عَٰبِدُونَ
[Our Sibghah (religion) is] the Sibghah (religion) of Allah (Islam) and which Sibghah (religion) can be better than Allah's? And we are His worshippers. [Tafsir Ibn Kathir.]
Chapter 21, Verse 92, The Prophets
سورة الأنبياء
إِنَّ هَٰذِهِۦٓ أُمَّتُكُمۡ أُمَّةٗ وَٰحِدَةٗ وَأَنَا۠ رَبُّكُمۡ فَٱعۡبُدُونِ
Truly! This, your Ummah [Sharia or religion (Islamic Monotheism)] is one religion, and I am your Lord, therefore worship Me (Alone). [Tafsir Ibn Kathir]
Chapter 23, Verse 52, The Believers
سورة المؤمنون
وَإِنَّ هَٰذِهِۦٓ أُمَّتُكُمۡ أُمَّةٗ وَٰحِدَةٗ وَأَنَا۠ رَبُّكُمۡ فَٱتَّقُونِ
And verily! This your religion (of Islamic Monotheism) is one religion, and I am your Lord, so keep your duty to Me.
Chapter 37, Verse 37, Those who set the ranks
سورة الصافات
بَلۡ جَآءَ بِٱلۡحَقِّ وَصَدَّقَ ٱلۡمُرۡسَلِينَ
Nay! he (Muhammad ﷺ) has come with the truth (i.e. Allah's religion - Islamic Monotheism and this Quran) and he confirms the Messengers (before him who brought Allah's religion - Islamic Monotheism).
Chapter 109, Verse 6, The Disbelievers
سورة الكافرون
لَكُمۡ دِينُكُمۡ وَلِيَ دِينِ
"To you be your religion, and to me my religion (Islamic Monotheism)."